[media] v4l: Make v4l2_subdev inherit from media_entity
V4L2 subdevices are media entities. As such they need to inherit from (include) the media_entity structure. When registering/unregistering the subdevice, the media entity is automatically registered/unregistered. The entity is acquired on device open and released on device close. Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NSakari Ailus <sakari.ailus@iki.fi> Acked-by: NHans Verkuil <hverkuil@xs4all.nl> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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