dt-bindings: display: mediatek: padding: add compatible for MT8195

Add a compatible string for the PADDING block in MediaTek MT8195 that
is controlled by MDP3.
Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml

@@ -20,7 +20,9 @@ description:
 
 properties:
   compatible:
-    const: mediatek,mt8188-disp-padding
+    enum:
+      - mediatek,mt8188-disp-padding
+      - mediatek,mt8195-mdp3-padding
 
   reg:
     maxItems: 1