Revert "HeadsUp: Add heads up quicksettings tile. (1/2)"

This reverts commit 3d8f4c6309c5cbaf98923473a1dde9af6cb2a631.

Conflicts:
	core/java/com/android/internal/util/cm/QSConstants.java
	packages/SystemUI/res/drawable-hdpi/ic_qs_heads_up_on.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_heads_up_on.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_heads_up_on.png
	packages/SystemUI/res/drawable-xxhdpi/ic_qs_heads_up_on.png
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java

Change-Id: I4c2e2dffa1d7568a4b8ebce49a779c44b9f6e41a