add Voice Wakeup switch

Change-Id: I1c129adf1104dd95d3afb76224af4c9ba2b5db96

Conflicts:
	src/com/android/settings/DevelopmentSettings.java
	src/com/android/settings/Settings.java
	src/com/android/settings/SettingsPreferenceFragment.java
	src/com/android/settings/cyanogenmod/LockscreenInterface.java