arm64: dts: st: introduce stm32mp23 SoCs family

STM32MP23 family is composed of 3 SoCs defined as following:

-STM32MP231: common part composed of 1*Cortex-A35, common peripherals
like SDMMC, UART, SPI, I2C, parallel display, 1*ETH ...

-STM32MP233: STM32MP231 + 1*Cortex-A35 (dual CPU), a second ETH, CAN-FD.

-STM32MP235: STM32MP233 + GPU/AI and video encode/decode, DSI and LDVS
display.

A second diversity layer exists for security features/ A35 frequency:
-STM32MP23xY, "Y" gives information:
 -Y = A means A35@1.2GHz + no cryp IP and no secure boot.
 -Y = C means A35@1.2GHz + cryp IP and secure boot.
 -Y = D means A35@1.5GHz + no cryp IP and no secure boot.
 -Y = F means A35@1.5GHz + cryp IP and secure boot.

Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20250225-b4-stm32mp2_new_dts-v2-5-1a628c1580c7@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>