V4L/DVB (9293): gspca: Separate and fix the sensor dependant sequences in t613.

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