Fixes for CBRS

* Make sure that KeyguardUpdateMonitor returns the complete list of
subscription info, so classes like CarrierTextController can filter it
(in the same way as NetworkControllerImpl).
* MobileSignalController state should identify a sim as data if it's the
active data sub, not the default.

Fixes: 135553848
Test: manual, CBRS set active data to be different than default and
observe QS Tile
Test: manual, CBRS set preferred data to be different than visible sub
and observe QS header signal icon and carrier info.

Change-Id: I4b348a951e65542b24d263760983c6a6d31dfa6d