arm64: dts: mt8173: Separating mtk-vcodec-enc device node

arm64: dts: mt8173: Separating mtk-vcodec-enc device node

There are two separate hardware encoder blocks inside MT8173.
Split the current mtk-vcodec-enc node to match the hardware architecture.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: Maoguang Meng <maoguang.meng@mediatek.com>
Signed-off-by: Irui Wang <irui.wang@mediatek.com>
Acked-by: Tiffany Lin <tiffany.lin@mediatek.com>
Link: https://lore.kernel.org/r/20210325122625.15100-2-irui.wang@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>