mediametrics_aidl_fuzzer: Add signal() to handle SIGPIPE

Since media.metrics service handles SIGPIPE,
adding signal handler to avoid abort() due to
broken pipe.

Test: ./mediaextractor_service_fuzzer
Bug: 300081809

Change-Id: Id835ee4b48f09b2bae63d23486af748c09c4597c
1 file changed