Use userfaultfd in COPY mode even when minor-fault available am: 41af30d7d4 am: 2d04f326ce

Original change: https://android-review.googlesource.com/c/platform/art/+/2393852

Change-Id: I45fbc20a907a56ef0a8b014e88b159d0c620a439
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>