Update TelephonySubscriptionTracker to use CarrierPrivilegesListener

This change adds use for CarrierPrivilegesListener to use the callbacks
as triggers to re-check carrier privileges. For simplicity, the carrier
privileges returned by the callback are not used, as it requires an
additional layer of caching. Instead, a query is performed, which
should hit a cache in the CarrierPrivilegesTracker, thus not be
performance-sensitive.

Bug: 183554244
Test: atest FrameworksVcnTests
Change-Id: Ia4529d087ee7f0deca7101c6849183ba7267c067