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: I0b3c65370ff18e615c6b853f934cfc7951d5c213
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>