pie can be glued to all four sides

Change-Id: I8e8b9a5bca4e956eaa4ca6d140311484e83f9498

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/PieControlPanel.java
	packages/SystemUI/src/com/android/systemui/statusbar/view/PieMenu.java