Bug: 73953797
Test: unit test
Change-Id: Id89c9100e8963a3cb890ebec347e4aabcd5fd4b8
(cherry picked from commit 4281d0ff57)
Merged-in: Id89c9100e8963a3cb890ebec347e4aabcd5fd4b8
restructure CarrierIdProvider into two tables
1. All - a private table which stores a complete mapping of all carriers
2. Current - a public table only stores the carrier identification of the
current active subs. require no permission to query.
expose the content url to public so that apps could be
notified on carrier identity change either on background or foreground.
Bug: 72571475
Test: runtest --path CarrierIdProviderTest.java
Test: Manual
Change-Id: If2a20288e63d25343f5bb582b35564d769a4e13b
