media: mtk-vcodec: venc: specify supported formats per-chip

Different chips have different supported formats. Move the list of
supported formats to the platform data, and split the output and capture
formats into two lists to make it easier to find the default format for
each queue.

[hverkuil: fixed some checkpatch alignment warnings]

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Acked-by: Tiffany Lin <tiffany.lin@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>