STM32MP release v2.2-r2.0

- FMC2: Update bindings for EBI support
- SMC: return correct error
- TAMPER: Add PINCTRL management for tamper if defined
- USB OTG: regulator mode update
- Update firewall on DDR CTRL and PHY (Allow read access for non-secure)
- Manage MCU reset through SCMI
- Add a new RETRAM property to configure state during low power
- Correct STGEN counter restore when returning from stop mode
- Add support of auto stop mode management
- Correct the exception fault return address
- Other minor fixes
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