Moving cow_size_updates to before partitions are parsed. am: 4565a2e8e6 am: c3d9de7ba9

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2224657

Change-Id: Ic42e3409a878328098c937cd5c8facc290453224
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>