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
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2