Merge "EnvironmentalReverb: Add AIDL placeholder implementation and its unit test" am: 4d58d01283 am: 20a7bf0e11 am: 4ef79ceb21

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2309206

Change-Id: Ib7f977151b6cde3f3eb4c34ffa09561204ce05ef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>