audio: Simplify AudioHalBinderServiceUtil::waitForFired() am: a76d4d8899

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2819039

Change-Id: I5cbe1fe61b1b36b9e49337bc0070f0c00dbbd5eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>