dt-bindings: arm64: mediatek: Add MT8395 Radxa NIO 12L board compatible

Add a board compatible for the Radxa NIO 12L, based on the MediaTek
MT8395 SoC.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240202114821.79227-2-angelogioacchino.delregno@collabora.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Documentation/devicetree/bindings/arm/mediatek.yaml

@@ -353,6 +353,7 @@ properties:
       - items:
           - enum:
               - mediatek,mt8395-evk
+              - radxa,nio-12l
           - const: mediatek,mt8395
           - const: mediatek,mt8195
       - items: