Add AIDL library to update_engine am: 8251dc06e1

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2125384

Change-Id: Icad450054e15ee5bf218eb7631141af038d56c65
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>