V4L/DVB (11417): gspca - m5602-ov9650: Autogain is on by default

Autogain is on by default, properly set the default value in the v4l2 ctrl.

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