drm/vc4: txp: fix writeback dimension checks and normalize rotation#7292

pelwell merged 2 commits intoraspberrypi:rpi-6.12.yraspberrypi/linux:rpi-6.12.yfrom

name2965:bugfix/txp-atomic-checkname2965/rpi-linux:bugfix/txp-atomic-checkCopy head branch name to clipboard