Revert "QS tiles custom background (1/2)"

This reverts commit e48f3d6.

Conflicts:
	packages/SystemUI/res/values/cr_colors.xml

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBa
r.java

Change-Id: I646dfdd25801ef73452ed8eba332e6950aa6dbb8