V4L/DVB: gspca_cpia1: Add basic v4l2 illuminator controls for the Intel Play QX3

This patch adds basic V4L2 controls for the illuminators on the Intel
Play QX3 microscope.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>