update_engine: add error log am: 1e56e35301

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2932912

Change-Id: Id87be22301e4933355bb1746f4d4a64a8f0e9b32
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>