This CL only adds the listener on device config changes, package added/changed/removed support will be added in a follow up. Bug: 190024878 Test: atest FrameworksMockingServicesTests:AppCompatOverridesServiceTest Test: atest FrameworksMockingServicesTests:AppCompatOverridesParserTest Change-Id: Ifda798abca5ed97cd4699dfd1244053ab2796586