Revert "HALO (1/2)"

This reverts commit efc213e9310b97c428b406bbda746e95316e4a13.

Conflicts:

	packages/SystemUI/res/drawable-xhdpi/halo_back_left.png
	packages/SystemUI/res/drawable-xhdpi/halo_back_right.png
	packages/SystemUI/res/drawable-xhdpi/halo_bg.png
	packages/SystemUI/res/drawable-xhdpi/ic_notify_halo_normal.png