media: dt-bindings: media: mtk-vcodec: Separating mtk vcodec encoder node

Updates binding document since the avc and vp8 hardware encoder in
MT8173 are now separated. Separate "mediatek,mt8173-vcodec-enc" to
"mediatek,mt8173-vcodec-enc-vp8" and "mediatek,mt8173-vcodec-enc".

This patch is not a compatible change, but we must do this modifaction
because MediaTek IOMMU add the device_link between the smi-larb
device and venc_device, if the venc device call the pm_runtime_get_sync,
the smi-larb's pm_runtime_get_sync also be called automatically.

There is a bit of backward compatibility for avc encoder, the avc
encoder device node still has compatible "mediatek,mt8173-vcodec-enc".

Acked-by: Tiffany Lin <[email protected]>
Signed-off-by: Hsin-Yi Wang <[email protected]>
Signed-off-by: Maoguang Meng <[email protected]>
Signed-off-by: Irui Wang <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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