[E58] Make adjustments for RevB of the module

Changes in this MR:

• Remove the STM32 driver built from the recipe and external repo, include the source code into linux-seco-mtk repository instead
• Enable some power rails in BL2 so that they are available in u-boot
• Rework the bootscript, as the overlays are managed by the straps in u-boot now
• Some changes to Baseboards overlays caused by hardware changes in RevB
• Adjust to renamed defconfigs and device trees to match SECO naming convention
• Rework config files
  • Use seco-base include file to match other platforms inside Clea OS
  • Reference as much as possible from meta-mediatek layers
  • Update config files to release v24.0 from upstream
• Add a few new overlays (16GB RAM, 10.1-inch display, disabling the serial ports on modules with WiFi chip that uses UART)
• Adjust OPTEE for 16GB RAM
• Minor fixes and adjustments