The kernel now ensures to restart PWM on color change.

Thus, there's no need to do it in user space anymore.
Also, adapt grpfreq and grppwm calculations and comments to actual
in-kernel implementation.

Change-Id: I657888391679c4b817e0c60e1a6e520e4adafba4
Fix android.os.cts.BuildVersionTest failure

Change-Id: Ic04d359be9b74d7f3afadbf09d2c4e0563d87d18

Conflicts:
	cm.mk