1) Don't change  the red and blue pre-gain's from their defaults
2) Actually make the powerline freq ctrl available to userspace
Signed-off-by: NHans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>