Add specific error codes to enable better error handling am: be0a349a6d

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2857466

Change-Id: I20b93b539bcd864a1f9d2d05f03a9f3d245d8a4b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>