mp_image: introduce a hw_subfmt field

For hwaccel formats, mp_image will merely point to a hardware surface
handle. In these cases, the mp_image_params.imgfmt field describes the
format insufficiently, because it mostly only describes the type of the
hardware format, not its underlying format.

Introduce hw_subfmt to describe the underlying format. It makes sense to
use it with most hwaccels, though for now it will be used with the
following commit only.

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