Refactored mediametrics_service_fuzzer

The following are updates to the fuzzer:
1. Randomised parameters
2. Improved code coverage of AudioAnalytics.cpp by 40%

Test: ./mediametrics_service_fuzzer
exec/s: 1148
Bug: 339558167

Change-Id: If29d348ab8033a5b8dbe0f2a4bab38d02135b6d5
1 file changed