Quicksettings: fix updating 2G,LTE and WifiTether tiles

adding an observer to listen for state changes

also move updating torch and navbarhide

Change-Id: I8dc8f9d804fcd47daaec50f0169fd5148d494cc6
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Conflicts:

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