Merge tag 'u-boot-stm32-20250930' of https://source.denx.de/u-boot/custodians/u-boot-stm

CI: https://source.denx.de/u-boot/custodians/u-boot-stm/-/pipelines/27776

- stm32mp1: Fix env_get_location()
- stm32mp2: Update register used by BL31 for boot parameter