Clear up CarrierPrivilegesListener APIs

CarrierPrivilegesListener has been replaced with
CarrierPrivilegesCallback. With all clients has been migrated, it is
time to remove the obsoleted APIs

Bug: 216549778
Test: atest CarrierPrivilegesTrackerTest CarrierServiceTest
Test: atest WifiCarrierInfoManagerTest TelephonyRegistryManagerTest
Test: atest TelephonySubscriptionTrackerTest
Change-Id: I89df21764d3b9945219d810d0dd9bfe3cf5fbea4