Fix NPE by initializing notification manager

- initializeSatelliteSystemNotification should be called before
  registerForSatelliteProvisionStateChanged

Bug: 378782898
Test: atest SatelliteControllerTest
FLAG: com.android.internal.telephony.flags.carrier_roaming_nb_iot_ntn
Change-Id: Ib9f083a3a6c956ff50a617a0775ffa735f9c92d3
1 file changed