[automerger skipped] Revert "userfaultfd: don't use unsupported feature" am: 1f512abdf6 -s ours am: 4943588ed1 -s ours

am skip reason: Merged-In Ibc67da6ca6cf00428166a423dfc612dc49344bb2 with SHA-1 5db5931b47 is already in history

Original change: https://android-review.googlesource.com/c/platform/external/linux-kselftest/+/3495391

Change-Id: I80d638da5669d6914305f98f17cad3d1988e039c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>