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v4l2codecs: add wrappers for alpha decode

Daniel Almeida requested to merge dwlsalmeida/gst-plugins-bad:v4l2slcodecalphabin into master

Codecalpha is a new plugin introduced to support VP8/VP9 alpha as defined in the WebM and Matroska specifications. It splits the stream into two streams, one for the alpha and one for the actual content, then it decodes them separately with vpxdec and finally combine the results as A420 or AV12 (i.e. YUV + an extra alpha plane).

The workflow above is set up by means of a bin, gstcodecalphabin.

This patch simulates the same workflow into the v4l2codecs namespace, thus using the new v4l2 stateless decoders for hardware acceleration.

This is so we can register the new alpha decode elements only if the hardware produces formats we support, i.e. I420 or NV12 for now.

Edited by Nicolas Dufresne

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