SystemUI: Update the service state of NetworkController

MSimNetworkController doesn't update NetworkController.mServiceState when
service state changes, so mServiceState always point to the old object.

Update mServiceState to make sure NetworkController check emergency call
only state correctly.

CRs-Fixed: 708875

Change-Id: Iacfdb20831459e1afc50c9b957543fcd5d62e04c