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Improve logging for call audio route switches.
1. Add start session for onCommunicationDeviceChanged listener. 2. Add logging in CallDiagnosticServiceController so we know that it saw an audio route update. Test: Manual testing to verify logging. Flag: NONE logging only change (bugfix). Bug: 401559693 Change-Id: I4ea309ba318b25aac055b093e19a42c724f893a9