Merge changes from topic "upstream-stm32mp257d-ultra-fly-sbc" into integration

* changes:
  feat(stm32mp2): use USART1 for debug console on ultra-fly boards
  feat(fdts): add support for STM32MP257D-based ultra-fly-sbc board
  feat(fdts): add dual-ranked LPDDR4 config for STM32MP2