Quiet Hours: Allow disabling phone ringer (1/3)

Change-Id: I73746443d1797c0f73a13faea2c422f5759b64a5
Merge "Quiet Hours: Allow disabling phone ringer (1/3)" into cm-11.0
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_frameworks_base into cd-4.4