audio: Disable the C++ backend for android.hardware.audio.core am: f84d640186

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2194570

Change-Id: I78415af773a0580e570e13456617f85666d75595
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>