V4L/DVB (11646): gspca - m5602-mt9m111: Disable QVGA until it has been verified to work

The QVGA resolution currently hasn't been verified to work. Disable it for now.

Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>