dts: stm32: introduce STM32MP25 SoCs family

STM32MP25 family is composed of 4 SoCs defined as following:

-STM32MP251: common part composed of 1*cortex-A35, common peripherals
like SDMMC, UART, SPI,

dts: stm32: introduce STM32MP25 SoCs family

STM32MP25 family is composed of 4 SoCs defined as following:

-STM32MP251: common part composed of 1*cortex-A35, common peripherals
like SDMMC, UART, SPI, I2C, PCIe, USB3, parallel and DSI display,
1*ETH ...

-STM32MP253: STM32MP251 + 1*cortex-A35 (dual CPU), a second ETH, CAN-FD
and LVDS display.

-STM32MP255: STM32MP253 + GPU/AI and video encode/decode.
-STM32MP257: STM32MP255 + ETH TSN switch (2+1 ports).

A second diversity layer exists for security features/ A35 frequency:
-STM32MP25xY, "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.

Available packages are:

STM32MP25xAI: 18*18/FCBGA 172 ios
STM32MP25xAK: 14*14/FCBGA 144 ios
STM32MP25xAL: 10*10/TFBGA 144 ios

More information available at:
Link: https://www.st.com/content/st_com/en/campaigns/microprocessor-stm32mp2.html [1]

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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