dt-bindings: display: mediatek: color: Add compatible for MediaTek MT6795

Add a compatible string for MediaTek Helio X10 MT6795's COLOR block: this
is the same as MT8173.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20230412112739.160376-10-angelogioacchino.delregno@collabora.com/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

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

@@ -33,6 +33,7 @@ properties:
           - const: mediatek,mt2701-disp-color
       - items:
           - enum:
+              - mediatek,mt6795-disp-color
               - mediatek,mt8183-disp-color
               - mediatek,mt8186-disp-color
               - mediatek,mt8188-disp-color