[Settings] Remove PhoneStateIntentReceiver

1. Replace PhoneStateIntentReceiver by adopting PhoneStateListener
2. Replace TelephonyProperties.in_ecm_mode() by
TelephonyManager.getEmergencyCallbackMode()

Bug: 144331663
Change-Id: Ib127cb165c65f50851c4390b05a16dfb8024fab1
Bug: 145830780
Test: Manual
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=AirplaneModeEnabler
Merged-In: Ib39ab1881484f65bc5a3834b2828c6ba98198cca