dt-bindings: mediatek: add mt8167 to hdmi, hdmi-ddc and cec bindings

Add mt8167 SoC compatible to Mediatek hdmi, hdmi-ddc and
cec schema bindings.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>