V4L/DVB (11408): gspca - m5602-s5k83a: Add led support to the s5k83a sensor.

This patch toggles the led seen on many laptops having a m5602 connected
to a Samsung s5k83a sensor.

Signed-off-by: Lukas Karas <lukas.karas@centrum.cz>
Signed-off-by: Erik Andr?n <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>