Migrate CarrierPrivilegeAuthenticator to asynchronous callbacks

onCarrierServiceChanged is the preferred async replacement for
the sync getCarrierServicePackageNameForLogicalSlot. Followup
changes will use this async method instead of the sync one, and
this change prepares for that.

Change-Id: Idd76d9502dfc8054e46532fa65fe135878a9a84a
Test: CtsNetTestCases
      FrameworksNetIntegrationTests
      FrameworksNetTests
      NetworkStackTests
      NetworkStaticLibTests
      TetheringTests
      MtsTetheringTestLatestSdk
      TetheringIntegrationTests
2 files changed