QS tiles background color [1/2]

This is a part of a commit from SlimRoms / Kufikugel:
https://github.com/SlimRoms/frameworks_base/commit/96375eb07138566f8b4efab35ee48b724e5b1654

All credits to him!

[log]

Change-Id: Ic785642cc6e30d48bda3463c63849a934b4ebf04

Conflicts:

	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java