dts: stm32: 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,

dts: stm32: 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: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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