Enable aidl cpp backend for "android.frameworks.stats" am: 1cca30245c

Original change: https://android-review.googlesource.com/c/platform/frameworks/hardware/interfaces/+/2316539

Change-Id: I19c01c8cac426b4ac3050637fed98586e08d7729
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>