arm: dts: stm32mp15: alignment with v5.18

arm: dts: stm32mp15: alignment with v5.18

Device tree alignment with Linux kernel v5.18-rc2:
- ARM: dts: stm32: Add support for the emtrion emSBC-Argon
  (only the pincontrol part)
- ARM: dts: stm32: Drop duplicate status okay from DHCOM gpioc node
- ARM: dts: stm32: add st,stm32-sdmmc2 compatible on stm32mp151
- ARM: dts: stm32: fix AV96 board SAI2 pin muxing on stm32mp15
- ARM: dts: stm32: use exti 19 as main interrupt to support RTC wakeup on
  stm32mp157
- ARM: dts: stm32: add DMA configuration to UART nodes on stm32mp151
- ARM: dts: stm32: keep uart4 behavior on *
- ARM: dts: stm32: Correct masks for GIC PPI interrupts on stm32mp15

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>