v4l2codecs: Add VP8 decoder
This adds VP8 support to the V4L2 Codecs. It's marked as a WIP for two reasons. I'll like to move some common code into helpers to reduce duplication between CODEC, I also encounter a weird behaviour of the kernel driver, which is to pad the CODED width/height. I was doing strict check on this, I'll try and see with the devs if it's me being too picky, or if the driver should be fixed.
Edited by Nicolas Dufresne