msm8960-common: power: Tuning and cleanups

 * Tune the governor for better power usage and interactivity
 * Reset tuning parameters if governor changes
 * Cleanup

Change-Id: I4e6638e2402e76e44b8804465a5e5be63f5b85f9
Merge "msm8960-common: power: Tuning and cleanups" into cm-10.1