V4L/DVB (11686): gspca - m5602-s5k4aa: Disable SXGA resolution for now

SXGA resolution needs more testing. Disable it for now

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