SystemUI: fix GPS toggle not changing states properly

When turning GPS on/off from outside the toggles (ie Settings),
it would not send updates to the callback implementations.

Change-Id: Ie462a9a160f8e262980bcf326685392546aee1ee
Signed-off-by: Roman Birg <romanbirg@gmail.com>

Conflicts:

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