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>