audio: Simplify AudioHalBinderServiceUtil::waitForFired() am: a76d4d8899 am: fcf3a1b36b am: f9f2412cef

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

Change-Id: Ic20f3123c0fefa0c57eddfed897b4f3f3687febe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>