media: v4l2-subdev: Add pad versions of dv timing subdev calls

Currently, subdev dv timing calls (i.e. g/s/query_dv_timings) are video
ops without a pad argument. This is a problem if the subdevice can have
different dv timings for each pad (e.g. a DisplayPort receiver with
multiple virtual channels).

To solve this, change these calls to include a pad argument, and put
them into pad ops. Keep the old ones temporarily to make the switch
easier.

Signed-off-by: Paweł Anikiel <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

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