audio: Simplify AudioHalBinderServiceUtil::waitForFired() am: a76d4d88 am: 331c6dfc am: bbbd592b

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



Change-Id: I6975a31316f1248efea00b603afebc65dd9fa851
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>