Telephony: Apply SPN override for cdma SIM (RUIM)

* Move spn override function to common IccRecords class to share between
  SIMRecords and RUIMRecords
* Fix a few places where we set PROPERTY_ICC_OPERATOR_ALPHA without using
  setTelephonyProperty, which is wrong for msim
* Add spn override to onAllRecordsLoaded() in RUIMRecords since IMSI record
  is loaded after SPN record

issue-id: RENDANG-421

Change-Id: I76731ec8355a02cd94f9b218fecb16dfa181063a
(cherry picked from commit 00239f17)