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v4l2videoenc: replace custom QUERY_CAPS handling with getcaps callback

The videoencoder base class uses getcaps() to ask a subclass for the caps in its sink_query_default() implementation.

Replace the custom handling of the QUERY_CAPS in the v4l2videoenc with an implementation of getcaps() that returns the caps that are supported by the v4l2videoenc to return these caps in the query.

This getcaps() implementation also calls the provided proxy_getcaps(), which sends a caps query to downstream. This fixes the v4l2videoenc element to respect limits of downstream elements in a sink query.

This fixes the same issue that is fixed by !4574 (closed), but makes use of the default implementation of GstVideoEncoder.


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