Halo: tablet mode support

Change-Id: I2c735b68b28ac0e2ccddc6a45e11e467321cf5fe

Conflicts:
	packages/SystemUI/res/layout/system_bar_notification_panel_title.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java