Pie control: available for devices without navbar, added option to enable pie, if not expanded desktop

Change-Id: I8beb4df6eb89d2cb67e1b53f184ffb64e28a0aba

Conflicts:

	res/values/arrays.xml
	src/com/android/settings/cyanogenmod/PieControl.java
	src/com/android/settings/cyanogenmod/SystemSettings.java