v4l2: Profile and level probing support for encoders and decoders
There used to be some profile/level support in encoders. This code was moved to GstV4l2Codecs and is now also used for decoders. The caps templates for the H.264, H.265, MPEG4, VP8 and VP9 encoders and decoders should now reflect the profiles and levels advertised by the kernel.
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