Merge tag 'u-boot-stm32-20241218' of https://source.denx.de/u-boot/custodians/u-boot-stm

CI: https://source.denx.de/u-boot/custodians/u-boot-stm/-/pipelines/23931

- Restore SPL boot from sdcard for STM32MP1 platforms
- Fix STACK_SIZE for STM32 MCU's board