Virtualizer: Add AIDL placeholder implementation and vts test am: 2d319dc8f3 am: 08be8b65fd am: 7fb4d73f6a

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2329855

Change-Id: Ide8cdb70a02828072f36c73b97573bb1d1e9a869
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>