fmq_test: Wait for test service before proceeding test.

For test HALs, since they are not present in manifest.xml,
waitForHwService() is necessary.

Test: MultipleReadersAfterOverflow no longer flaky.
Bug: 63825555
Change-Id: I73385ab59beb7b054c9083d875ec4ba79555c6d3
Merged-In: I73385ab59beb7b054c9083d875ec4ba79555c6d3
1 file changed