Create CarrierPrivilegesListener callback.

This callback will allow privileged components to listen to changes
around carrier privileged apps in a way that is aware and accounts for
SIM profile switches. This callback will be backed by
CarrierPrivilegesTracker as a follow-up change.

Bug: 205736323
Test: atest android.telephony.cts.TelephonyRegistryManagerTest
Change-Id: I432ed00be16c68303bf5c8e074fb9d6cf83e82c9