libv4l: libv4lconvert support for SQ905C

libv4l: libv4lconvert support for SQ905C

From: Theodore Kilgore <kilgota@auburn.edu>

Support the decompression used by the SQ905C cameras (0x2770:0x905C) and
some other related cameras. There is at the moment no support module for
these cameras in streaming mode, but I intend to submit one.

This contribution was created in whole by me, based upon code in libgphoto2
which was created in whole by me, and which was licensed for
libgphoto2 under the LGPL license.

Priority: normal

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