Fix serialization issue of ExternalVibration Remove excessive serialization of Audio Attributes Bug: 140417434 Test: atest ExternalVibrationTest#testSerialization Change-Id: Ib7ceaed875889126a53f874eec64fab4817e48d1 (cherry picked from commit b1a33a8b4fd4b1603c0465a904be29f0c4a07e64)