Update fuzzService to call most common transactions easily

Changing transaction code path in fuzzService so that most commonly
used transact code in AIDL services can be reached and coverage
can be improved.

Test: atest fuzz_service_test
Bug: 300115015
Change-Id: Ifaef7566491e6369e21f2ca3a7724a73f9bbf002
1 file changed