Add cli option to enable multi-threaded compression am: 6bef4902b4 am: 6ca3e0028d

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2453985

Change-Id: I86baf734059483d795c8b1a5f71bc8b56ed18b97
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>