[media] media: blackfin: bfin_capture: use vb2_fop_mmap/poll
No need to reinvent the wheel. Just use the already existing functions provided by vb2. Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com> Tested-by: Scott Jiang <scott.jiang.linux@gmail.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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