UI not updated correctly in expanded statusbar

Sometimes when getting status changes in expanded statusbar the
text disappear. Both NetworkController and PhoneStatusBar handles
UI updates and they are not in sync. This fix allows PhoneStatusBar
to update UI when NetworkController is updating the UI.

Change-Id: I46b8a24ecc732e441f836692c6584a78d8108dff
Merge "UI not updated correctly in expanded statusbar" into android-4.4