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>
Framework: NavBarColor (1/2)

Change-Id: I7ed579d95d921e08d8f9d0a9160605457b8c4cb3
Merge remote-tracking branch 'aokp/jb-mr1' into jb-mr1