V4L/DVB (12501): gspca - sonixj: Do the ov7660 sensor work again.

- bad sensor power
- bad edge gain/threshold
- set back the auto gain
- light frequency filter inverted

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