Merge commit '5da51284'

* commit '5da51284':
  cavs: Add a dependency on h264chroma
  lavc: Split out ff_hwaccel_pixfmt_list_420[] over individual codecs

Conflicts:
	libavcodec/h263dec.c
	libavcodec/h264.c
	libavcodec/mpeg12.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>