Add the missing AUDIO_* ioctls and document the V4L2 replacements for the
various DVB AUDIO ioctls that were (ab)used by V4L2.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>