v4l2videodec: support negotiation for downscale when sink getcaps
For some video decoders that support downscale, sink caps is empty with current gst_v4l2_video_dec_sink_getcaps(). So make this code change.
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For some video decoders that support downscale, sink caps is empty with current gst_v4l2_video_dec_sink_getcaps(). So make this code change.