Quicksettings: add network speed indicator tile (1/2)

Conflicts:
	core/java/com/android/internal/util/mahdi/QSConstants.java
	core/java/com/android/internal/util/mahdi/QSUtils.java
	packages/SystemUI/res/values/mahdi_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java

Change-Id: Ic0513818d3ac91ef5e080a80399f4742a01da085