espressif: fix Wi-Fi IRQ issue during SPI Flash operations

[fdcavalcanti]

Summary

Wi-Fi interrupt setup in the ESP32/ESP32-S2/ESP32-S3 (Xtensa) and ESP32-C3/C6 (RISC-V) Wi-Fi adapters now uses the HAL’s global vector descriptor (get_desc_for_int) instead of a separately allocated vector_desc, and registers each line as not in IRAM via esp_intr_set_in_iram(handle, false). That aligns Wi-Fi IRQs with esp_intr_noniram_disable() so they are masked while SPI flash operations hold the cache disabled, reducing risk of Wi-Fi ISRs running from flash in that window.

• 3405a94f29 arch/risc-v: register Wi-Fi IRQs in non_iram mask for SPI flash
• 909177e5b7 arch/xtensa: register Wi-Fi IRQs in non_iram mask for SPI flash

This PR fixes an issue where SPI Flash and Wi-Fi would crash when used together. The reason was that Wi-Fi interrupts were accessing cached functions while it was disabled. The correct operation here is to disable Wi-Fi interrupts while cache is off.

Impact

Impact on user: YES — Wi-Fi stability on Espressif boards when SPI flash holds the cache disabled; no public API change.

Impact on build: NO

Impact on hardware: YES — ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 (Wi-Fi + SPI flash coexistence).

Impact on documentation: NO

Impact on security: NO

Impact on compatibility: NO

Testing

Building

• ./tools/configure.sh esp32c6-devkitc
• make (with usual parallelism)
• Flash the board with your usual method for this defconfig

Running

• wapi psk wlan0 <password> 3 2
• wapi essid wlan0 <ssid> 1
• renew wlan0
• wapi save_config wlan0

Results

Before the changes, wapi save_config would simply crash with no warning or backtrace. Now it works properly.

nsh> wapi psk wlan0 espmint123 3 2
nsh> wapi essid wlan0 Nuttx-IOT 1
nsh> renew wlan0
nsh> wapi save_config wlan0
nsh> echo $?
0
nsh> cat /data/wapi.conf
{"wlan0":{"mode":2,"auth":4,"cmode":8,"alg":3,"ssid":"Nuttx-IOT","bssid":"e0:1c:fc:00:??:??","psk":"espmint123"}}nsh> 

[acassis]

@fdcavalcanti I opened an Issue about this wapi.conf keeping the password in plain text:

#18710