Add MEDIA_ENT_F_PROC_VIDEO_EN/DECODER to be used for the encoder
and decoder entities of codec hardware.

[mchehab+samsung@kernel.org: split description on two senteces by adding dots]
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Acked-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>