QuickSettings: change signal tile to turn on/off mobile data

There is no method to turn on mobile data with 1-2 touches. Every method
implies that you press 3-4 times, and for me this is annoying.

This commit add the action to turn on/off mobile data on signal tile touch
and long touch to go to data usage.

Change-Id: I17e0041464fabb3cf42faf5680b9945bb63b20d9

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettings.java