V4L/DVB (13424): gspca - ov534: Fix ov772x brightness and ov965x frame rate.

- the ov772x brightness was not setteble (fixed by M. Thrun)
- the set_frame_rate function does not work for ov965x

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