audio: Disable the C++ backend for android.hardware.audio.core am: f84d640186 am: 0dee516d06 am: e4b61098a8

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

Change-Id: Ibd6b667d9797adf77f804dcd22b2e2f0cbee7c31
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>