Allow host cow_converter to change compression param am: 83bb5d5fd2 am: 42526f7937

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2816329

Change-Id: I1844666947ec8ebdd5c2776ec75c6a14f271e521
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>