V4L/DVB (8353): gspca: 640x480 for bridge sn9c103 / sensor ov7630.

sonixb:   640x480 mode for sn9c103 - ov7630.

Signed-off-by: Andoni Zubimendi <andoni.zubimendi@gmail.com>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>