mmap/poll file operation and several ioctl handlers are replaced
with the vb2 helper functions. Some helpers are used indirectly
to maintain the buffer queue ownership.
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>