Add aidl_interface for update_engine am: 6d8a94df0c am: 86074e8d4d

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3290648

Change-Id: I3679691e27ced1662b566a9e88315fb8de554816
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>