[media] coda: set allow_zero_bytesused flag for vb2_queue_init

The coda driver interprets a buffer with bytesused equal to 0 as a special
case indicating end-of-stream. After vb2: fix bytesused == 0 handling
(8a75ffb8) patch videobuf2 modified the value of bytesused if it was 0.
The allow_zero_bytesused flag was added to videobuf2 to keep
backward compatibility.

Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>