selftests: add soft-dirty into run_vmtests.sh

Link: https://lkml.kernel.org/r/20220725142048.30450-4-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

tools/testing/selftests/vm/run_vmtests.sh

@@ -190,4 +190,6 @@ then
 	run_test ./protection_keys_64
 fi
 
+run_test ./soft-dirty
+
 exit $exitcode