arm64: dts: mt8183: Add encoder node

Add encoder node.

Signed-off-by: Hsin-Te Yuan <yuanhsinte@chromium.org>
Link: https://lore.kernel.org/r/20240911-venc-v2-1-5566c07756fd@chromium.org


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