STM32 DT for v6.10, round 1

Highlights:
----------

- MPU:
  - STM32MP13:
    - Add and enable LTDC display (rocktech,rk043fn48h)
      on stm32mp135f-dk.
    - Add firewall bus based on  ETZPC firewall controller.
    - Add PWR regulator support: Can be only used if the platform is
      set as "no-secure" (RCC_SECCFGR cleared) either use SCMI
      regulator.

  - STMP32MP15:
    - Add firewall bus based on  ETZPC firewall controller.
    - Add heartbeat on stm32mp157c-ed1.

  - STM32MP25:
    - Add firewall bus based on  RIFSC firewall controller.
    - Add clock support (RCC) based on SCMI clock protocol for root clocks.
    - Add all I2C instances and declare i2c2/i2c8 on stm32mp257f-ev1.
    - Add all SPI instances. and declare spi3/spi8 on stm32mp257f-ev1.
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