selftests/mm: add shmem-private test to uffd-stress

The userfaultfd stress test never tested private shmem, which I think was
overlooked long due.  Add it so it matches with uffd unit test and it'll
cover all memory supported with the three memory types.

Meanwhile, rename the memory types a bit.  Considering shared mem is the
major use case for both shmem / hugetlbfs, changing from:

  anon, hugetlb, hugetlb_shared, shmem

To (with shmem-private added):

  anon, hugetlb, hugetlb-private, shmem, shmem-private

Add the shmem-private to run_vmtests.sh too.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Peter Xu <[email protected]>
Cc: Axel Rasmussen <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Cc: Zach O'Keefe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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