V4L/DVB (10986): mr97310a: don't discard frame headers on stream output

Fix a bug where all frame headers were being discarded, instead of being part of the
stream output, on MR97310A cameras.

The frame headers contain information which may be useful in processing
the video output and therefore should be kept and not discarded.

A corresponding patch to the decompression algorithm in
libv4lconvert/mr97310a.c corrects the change in frame offset.

Signed-off-by: Theodore Kilgore <kilgota@auburn.edu>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>