Merge changes from topic "st-fixes" into integration

* changes:
  fix(spi-nand): add Quad Enable management
  fix(st-clock): disabling CKPER clock is not functional on stm32mp13
  fix(st-uart): skip console flush if UART is disabled
  fix(st): flush UART at the end of uart_read()
  fix(stm32mp1): use the BSEC nodes compatible for stm32mp13
  fix(stm32mp13-fdts): correct the BSEC nodes compatible
  fix(stm32mp1-fdts): move /omit-if-no-ref/ to overlay files
  fix(stm32mp1): properly check PSCI functions return