vb2: rename queued_count to owned_by_drv_count

vb2: rename queued_count to owned_by_drv_count

'queued_count' is a bit vague since it is not clear to which queue it
refers to: the vb2 internal list of buffers or the driver-owned list
of buffers.

Rename to make it explicit.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
(cherry picked from commit 6ea3b980f058d9dbc79ba88c652d581fa2d00792)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Conflicts:
	drivers/media/v4l2-core/videobuf2-core.c