Gamma Control: change range

The current userspace implementation really hates negative numbers on
the slider bars. Let's accept 0 to 120, with nominal values achieved as
echo "60 60 60" > /sys/class/misc/gammacontrol/tuner and trinity blue as
"60 60 80"

Change-Id: Ic6768baf53997a5984e9470e423d080e64b217b5
GammaControl: Only apply tuner params that are modified

Lighten up on the number of rgb shift calculations & only apply
modified tuner params.

Change-Id: Ie6e0d1957f64fc4fa69fbb7af2447c02e85dcbde
Signed-off-by: Luis Cruz <ljc2491@gmail.com>
GammaControl: Fix userspace/kernelspace default mismatch

It's the little things we forget about...

Change-Id: I8ecd6a0cdab2c4dbb1dc90b632478fbbbf05e18c
Signed-off-by: Luis Cruz <ljc2491@gmail.com>