Initialize userfaultfd availability even when not using it am: 6c6e2df516 am: 409f480fdb am: 08c774ca53

Original change: https://android-review.googlesource.com/c/platform/art/+/2402134

Change-Id: I1ae8a7b4edc8a0cd8e9ae99a4db81d36bfaf6675
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>