dts: stm32: add stm32mp257f-dk board support

Add STM32MP257F Discovery board support. It embeds a STM32MP257FAL SoC,
with 2GB of LPDDR4, 2*USB typeA, 1*USB3 typeC, 1*ETH, wifi/BT combo,
DSI HDMI, LV

dts: stm32: add stm32mp257f-dk board support

Add STM32MP257F Discovery board support. It embeds a STM32MP257FAL SoC,
with 2GB of LPDDR4, 2*USB typeA, 1*USB3 typeC, 1*ETH, wifi/BT combo,
DSI HDMI, LVDS connector ...

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>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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