V4L/DVB (8354): gspca: Better gain for bridge sn9c10x - sensor ov6650.

sonixb:   Better gain for ov6650.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>