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Improves service state changed notification
The service of GsmCdmaPhone and ImsPhone are changed independently, but the service state tracker only notify the service state of GsmCdmaPhone. This changed make the ServiceStateTracker notify the merged state of GsmCdmaPhone and ImsPhone even if these two phone change their service state independently. Bug: 67471135 Test: manually test and unit test Change-Id: Iba99fc2b02ae536897d9cde07d81b6ab64b5a9cb