update_engine: use cow_size_info am: 09d022d905 am: a4c9284d61

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2829130

Change-Id: I5118e8f90073e1073d811a638e9c27fbb075ef99
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>