[automerger skipped] Revert "userfaultfd: don't use unsupported feature" am: 5db5931b47 -s ours am: 05db520b27 -s ours

am skip reason: Merged-In Ibc67da6ca6cf00428166a423dfc612dc49344bb2 with SHA-1 cde95c9944 is already in history

Original change: https://android-review.googlesource.com/c/platform/external/linux-kselftest/+/3494848

Change-Id: Ie257ad8acc73c7153f0f32d59786e980eba828d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>