dt-bindings: display: add STM32 LVDS device

Add "st,stm32mp25-lvds" compatible.

Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240226-lvds-v6-1-15e3463fbe70@foss.st.com