Reenabling CM volume buttons custom functions

- This is temporary. When CM re-implemets i will follow.

Change-Id: Iea7ceca70b5ed762f81578810bd580633cee3d09
Merge remote-tracking branch 'origin/4.4-test' into gz44
Merge branch 'gz44' of https://github.com/GroundZero44/android_packages_apps_Settings into gz44