dt-bindings: stm32: document stm32mp257f-ev1 board

Add new entry for stm32mp257f-ev1 board.

Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
This commit is contained in:
Alexandre Torgue 2023-05-24 16:39:51 +02:00
commit 6defdc2689