Merge tag 'u-boot-stm32-20221018' of https://source.denx.de/u-boot/custodians/u-boot-stm

- stm32mp: fix compilation issue with DEBUG_UART
- DT update :
  - Remove buck3 regulator-always-on on AV96
  - Enable btrfs support on DHSOM
  - Drop extra newline from AV96 U-Boot extras DT
  - Add DHCOR based Testbench board
  - Fix and expand PLL configuration comments
  - update SCMI dedicated file