dt-bindings: soc: mediatek: Add mdp3 mutex support for mt8186

Add mdp3 mutex compatible for mt8186 SoC.
Co-developed-by: Xiandong Wang <xiandong.wang@mediatek.com>
Signed-off-by: Xiandong Wang <xiandong.wang@mediatek.com>
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220831172151.10215-2-allen-kh.cheng@mediatek.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Documentation/devicetree/bindings/soc/mediatek/mediatek,mutex.yaml

@@ -30,6 +30,7 @@ properties:
       - mediatek,mt8173-disp-mutex
       - mediatek,mt8183-disp-mutex
       - mediatek,mt8186-disp-mutex
+      - mediatek,mt8186-mdp3-mutex
       - mediatek,mt8192-disp-mutex
       - mediatek,mt8195-disp-mutex