va: filter & postproc: Match color with caps features.
When fixating color, there might be "other caps" with color spaces not
supported by the caps features exposed in the vapostproc's source pad
caps template (perhaps it's a bug somewhere else in GStreamer).
This solution checks if the proposed format exists in the filter within the caps feature associated with the proposed format.
The check is done with the new filter's function gst_va_filter_has_video_format().