dt-bindings: i2c: update bindings for MT8186 SoC

Add a DT binding documentation for the MT8186 soc.
Signed-off-by: Kewei Xu <kewei.xu@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt

@@ -14,6 +14,7 @@ Required properties:
       "mediatek,mt7629-i2c", "mediatek,mt2712-i2c": for MediaTek MT7629
       "mediatek,mt8173-i2c": for MediaTek MT8173
       "mediatek,mt8183-i2c": for MediaTek MT8183
+      "mediatek,mt8186-i2c": for MediaTek MT8186
       "mediatek,mt8192-i2c": for MediaTek MT8192
       "mediatek,mt8195-i2c", "mediatek,mt8192-i2c": for MediaTek MT8195
       "mediatek,mt8516-i2c", "mediatek,mt2712-i2c": for MediaTek MT8516