update_engine: update another read size am: 6963a9296d am: f1e645ee5c

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3234524

Change-Id: If7cddf352b77e2e18148e345125d6c126767e0c4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>