tree 709deb476a746779664f31b9ec9631a06e7cc8d2
parent cb43b581dbd0813fa22e5cc76aa6a7d7750043b6
author Jack Yu <jackyu@google.com> 1594147702 -0700
committer Jack Yu <jackyu@google.com> 1594160825 -0700

Fixed incorrect cell identity for geo scope support

The geographical scope support defined by 3GPP TS 23.041
9.4.1.2.1 requires the cell identity including MCC/MNC, LAC/TAC,
and CID from the registered network. The cell identity cell broadcast
service retrieved is not correct.

This fixed several issues in cell broadcast service.

1. Cell broadcast service used the MCC/MNC from the SIM, not from
   current registered network.
2. Cell broadcast service uses a ramdom cell info return by telephony
   manager's getAllCellInfo, which returns both registered and nearby
   cells. We should get cell identity from CS network, PS network,
   then nearby cells.
3. Cell broadcast service can only handle GSM cell identity, but not
   UMTS/LTE/NR cell identity.

Fix: 157618105
Test: Manual & unit tests
Change-Id: Id9310efc0bda7d5fa158d2be84782ce178c3a299