V4L/DVB (11411): gspca - m5602: Rework v4l ctrl handling in all sensors

Previously, all sensors allocated a part of a large ctrl vector.
Define this vector separately for each sensor instead.

Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>