Settings: show force overflow if any bindable keys available

Change-Id: I8f15db14fe09a7ff00d7c3f6088bb53691c1aed5
Merge "Settings: show force overflow if any bindable keys available" into cm-10.2
Settings: ensure SystemSettingCheckBoxPreference defaultValue is set

Change-Id: If2a6234ad78e7b03de86f72e866633817cf888c5
Settings: Lock screen music controls should default to on

This matches AOSP

Change-Id: Ia2cfd5fd59eeea27374533cc3db5ee0c9bb00b44
Merge branch 'cm-10.2' into martincz