arm64: dts: mediatek: mt8186: Add venc node

Add video encoder node.

Signed-off-by: Kyrie Wu <kyrie.wu@mediatek.com>
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: Hsin-Yi Wang <hsinyi@chromium.org>
[eugen.hristev@collabora.com: minor cleanup]
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231228113245.174706-7-eugen.hristev@collabora.com


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>