Support erofs files which have their last block unaligned am: 0503d7af4b am: 743d82578e

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2578757

Change-Id: I8ec092a945e44c326a04f3208d539ade105ddb46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>