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

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

Change-Id: I56e081b70b7088f7aee5b2c1860175390d3bc91b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>