mako: Add saturation control to gamma calibration

This change depends on http://review.cyanogenmod.org/#/c/51332/ and
http://review.cyanogenmod.org/#/c/51499/

Change-Id: Icd1e6600c6f0c88f1ae9c2224d17af5daeca77ad
Merge branch 'cm-10.2' into martincz