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
mako: Use CM PowerHAL

Change-Id: I13ec133f7057616ee56ec69767fbef1902a6b085
Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_device_lge_mako into HEAD