RP2350: adding complete bsp support

[PThierry]

This PR add the full support for rp2350 Raspberry Pi SoC used in Pico2W.
The goal is to validate the complete boot of Sentry-kernel on this board, in ARM mode by now (RISC-V support will be added later).
The boot is still kept single-core mode by now.

[Copilot]

Pull request overview

Adds initial BSP bring-up for the Raspberry Pi RP2350 (Pico 2 W), targeting single-core ARM boot, by introducing RP2350-specific drivers, DT templates, and build/Kconfig integration needed to validate early kernel boot and debug output.

Changes:

• Add RP2350 BSP drivers (USART debug TX, RCC/PWR, GPIO/pinctrl, DMA, sysinfo, plus stubs for other subsystems).
• Add RP2350 Kconfig/arch integration (SOC selection, buses header, static IRQ list) and Meson wiring for new driver subdirs/templates.
• Add RP2350 DTS example(s) and a rpi_pico2w_defconfig for building/running on Pico 2 W.

Reviewed changes

Copilot reviewed 52 out of 55 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
kernel/src/managers/memory/memory_shm-dt.h.in	Adjusts DTS iteration for SHM list size generation.
kernel/src/managers/memory/memory_shm-dt.c.in	Adjusts DTS iteration for SHM metadata table generation.
kernel/src/drivers/usart/rp2350/rp2350-usart.c	Adds RP2350 UART debug TX driver.
kernel/src/drivers/usart/rp2350/rp2350-usart-dt.h.in	Adds RP2350 UART DT-generated descriptor header template.
kernel/src/drivers/usart/rp2350/rp2350-usart-dt.c.in	Adds RP2350 UART DT-generated descriptor source template.
kernel/src/drivers/usart/rp2350/meson.build	Hooks RP2350 USART DT generation + driver into build.
kernel/src/drivers/usart/meson.build	Selects USART subdir per SoC (adds RP2350).
kernel/src/drivers/sysinfo/sysinfo.h	Adds vendor-derived SYSINFO register header (in src tree).
kernel/src/drivers/sysinfo/sysinfo.c	Adds SYSINFO driver to read chip id/revision.
kernel/src/drivers/sysinfo/meson.build	Builds sysinfo driver when RP2350 is selected.
kernel/src/drivers/syscfg/rp2350/rp2350-syscfg.c	Adds RP2350 SYSCFG stub implementation.
kernel/src/drivers/syscfg/rp2350/meson.build	Hooks RP2350 syscfg stub into build.
kernel/src/drivers/syscfg/meson.build	Adds RP2350 syscfg subdir selection.
kernel/src/drivers/smp/rp2350/rp2350-cpuid.c	Adds RP2350 SMP cpuid stub (single-core behavior).
kernel/src/drivers/smp/rp2350/meson.build	Hooks RP2350 smp stub into build.
kernel/src/drivers/smp/meson.build	Adds RP2350 smp subdir selection.
kernel/src/drivers/rng/rp2350/rp2350-rng.c	Adds RP2350 RNG stub implementation.
kernel/src/drivers/rng/rp2350/meson.build	Hooks RP2350 rng stub into build.
kernel/src/drivers/rng/meson.build	Adds RP2350 rng subdir selection.
kernel/src/drivers/meson.build	Adjusts driver subdir gating and adds sysinfo subdir.
kernel/src/drivers/gpio/rp2350/rp2350-pinctrl.c	Adds RP2350 pinctrl configuration helper.
kernel/src/drivers/gpio/rp2350/rp2350-gpio.c	Adds RP2350 GPIO driver implementation.
kernel/src/drivers/gpio/rp2350/meson.build	Hooks RP2350 GPIO sources into build.
kernel/src/drivers/gpio/meson.build	Selects GPIO subdir per SoC (adds RP2350).
kernel/src/drivers/flash/rp2350/rp2350-flash.c	Adds RP2350 flash stub probe.
kernel/src/drivers/flash/rp2350/meson.build	Hooks RP2350 flash stub into build.
kernel/src/drivers/flash/meson.build	Selects flash subdir per SoC (adds RP2350).
kernel/src/drivers/exti/rp2350/rp2350-exti.c	Adds RP2350 EXTI stub implementation.
kernel/src/drivers/exti/rp2350/meson.build	Hooks RP2350 exti stub into build.
kernel/src/drivers/exti/meson.build	Adds RP2350 exti subdir selection.
kernel/src/drivers/dma/st/stm32u5-gpdma.c	Adds STM32U5 GPDMA driver implementation.
kernel/src/drivers/dma/st/stm32-gpdma-dt.h.in	Adds STM32U5 GPDMA DT-generated descriptor header template.
kernel/src/drivers/dma/st/stm32-gpdma-dt.c.in	Adds STM32U5 GPDMA DT-generated descriptor source template.
kernel/src/drivers/dma/st/meson.build	Hooks STM32U5 GPDMA DT generation + driver into build.
kernel/src/drivers/dma/rp2350/rp2350-gpdma.c	Adds RP2350 DMA driver implementation.
kernel/src/drivers/dma/rp2350/rp2350-gpdma-dt.h.in	Adds RP2350 DMA DT-generated descriptor header template.
kernel/src/drivers/dma/rp2350/rp2350-gpdma-dt.c.in	Adds RP2350 DMA DT-generated descriptor source template.
kernel/src/drivers/dma/rp2350/meson.build	Hooks RP2350 DMA DT generation + driver into build.
kernel/src/drivers/dma/meson.build	Refactors DMA build selection into SoC-specific subdirs.
kernel/src/drivers/clk/rp2350/rp2350-rcc.c	Adds RP2350 reset/clock (RCC-like) driver.
kernel/src/drivers/clk/rp2350/rp2350-rcc-dt.h.in	Adds RP2350 RCC DT-generated header template (core clock define + desc).
kernel/src/drivers/clk/rp2350/rp2350-rcc-dt.c.in	Adds RP2350 RCC DT-generated descriptor source template.
kernel/src/drivers/clk/rp2350/rp2350-pwr.c	Adds RP2350 PWR stub implementation.
kernel/src/drivers/clk/rp2350/meson.build	Hooks RP2350 clock DT generation + RCC/PWR into build.
kernel/src/drivers/clk/meson.build	Selects clock subdir per SoC (adds RP2350).
kernel/src/arch/asm-cortex-m/Kconfig	Adds RP2/RP2350 SoC family/subfamily selections.
kernel/include/sentry/arch/asm-cortex-m/rp2350/irq_defs.h.in	Adds static RP2350 IRQ definitions.
kernel/include/sentry/arch/asm-cortex-m/rp2350-buses.h.in	Adds minimal RP2350 bus definitions for RCC API compatibility.
kernel/include/sentry/arch/asm-cortex-m/meson.build	Switches IRQ defs generation to static RP2350 list when selected; adds RP2350 buses template.
kernel/include/bsp/drivers/sysinfo/sysinfo.h	Adds BSP-level SYSINFO public API header.
kernel/include/bsp/drivers/meson.build	Installs sysinfo BSP header for RP2350 builds.
dts/meson.build	Adds RP2350 board DTS example to install list.
dts/examples/rpi_pico2w.dts	Adds Pico 2 W (RP2350) DTS example.
dts/examples/rpi_pico2w_debug.dts	Updates Pico 2 W debug DTS to define debug stdout + enable UART.
configs/rpi_pico2w_defconfig	Adds RP2350 defconfig for standalone single-core boot.

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