PIE: option for Pie to maintain its position, disregarding orientation changes (useful for gaming)

Change-Id: I2bde8ee6f6fdff602a1241d4da7fd88ed3216477

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