[media] gspca - zc3xx: Bad clocksetting for mt9v111_3 with 640x480 resolution

The bad value prevented the autogain to work correctly
and some images were truncated.

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>