Refactored mediarecorder_fuzzer

The following are updates to the fuzzer:
1. Randomized order of API calls.
2. Updated enums and kParametersList.
3. Coverage improved from 69% to 72%.

Test: ./mediarecorder_fuzzer
exec/s: 10
Bug: 313038371

Change-Id: I2dff26956771b0b8566bd56b4cbfc307c1602258