audio: Simplify AudioHalBinderServiceUtil::waitForFired() am: a76d4d8899 am: 331c6dfc50

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

Change-Id: Ie3faa087820e5a6685316fd49bf3323cb171017b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>