Merge commit '3d197514'

* commit '3d197514':
  qsvenc: Allow use of hw_device_ctx to make the internal session
  qsvdec: Allow use of hw_device_ctx to make the internal session
  qsv: Add ability to create a session from a device
  doc: Add VAAPI encoders
  vaapi_encode: Add VP9 support
  vp9: Add bsf to fix reordering in raw streams

This commit is a noop, see
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28aedeedMerged-by: James Almer <jamrial@gmail.com>