Refactored mediaplayer_fuzzer

The following are the updates to the fuzzer:
1. API and Parameter Randomization.
2. Coverage improved from 47% to 60% with initial corpus feed.

execs/s: 10
Test: ./mediaplayer_fuzzer corpus/
Bug: 313038371

Change-Id: Ife29936adffa7d8c4cab32f1db20baaa7e9f2f8f
15 files changed