userfaultfd: don't use unsupported feature

UFFD_FEATURE_PAGEFAULT_FLAG_WP was added in linux 5.7 and currently
unsupported in Android >5.10.

Bug: 234150821
Test: atest vts_linux_kselftest_x86_64:vm_userfaultfd_anon_x86_64#vm_userfaultfd_anon_x86_64
Test: atest vts_linux_kselftest_x86_64:vm_userfaultfd_shmem_x86_64#vm_userfaultfd_shmem_x86_64
Signed-off-by: Edward Liaw <edliaw@google.com>
Change-Id: Ice2a9d3e427f717037175e68d5e209063c6693ee
2 files changed