update_engine: fix 32bit system type error am: da3a49b919 am: cdde7b05a2

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3225962

Change-Id: I03e9015f2bd54e1fae7fbd4f58daa559821bb5e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>