Revert "userfaultfd: don't use unsupported feature"

This reverts commit 4a3ec628c054e6f5fc86ee1499ad130a18aba9c7.
Remove hack to bypass UFFD_FEATURE_PAGEFAULT_FLAG_WP not being
supported.

Bug: 331397584
Test: atest vts_linux_kselftest_x86_64:vm_userfaultfd_anon_x86_64
Test: atest vts_linux_kselftest_x86_64:vm_userfaultfd_shmem_x86_64
Signed-off-by: Edward Liaw <[email protected]>
(cherry picked from https://android-review.googlesource.com/q/commit:cde95c99440c86195922043910c3d3335ff58f45)
Merged-In: Ibc67da6ca6cf00428166a423dfc612dc49344bb2
Change-Id: Ibc67da6ca6cf00428166a423dfc612dc49344bb2
2 files changed