dt-bindings: usb: mtk-xhci: add compatible for mt8186

Add compatible for mt8186

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Link: https://lore.kernel.org/r/20220216120025.29860-1-allen-kh.cheng@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml

@@ -30,6 +30,7 @@ properties:
           - mediatek,mt7629-xhci
           - mediatek,mt8173-xhci
           - mediatek,mt8183-xhci
+          - mediatek,mt8186-xhci
           - mediatek,mt8192-xhci
           - mediatek,mt8195-xhci
       - const: mediatek,mtk-xhci