selftests/mm: .gitignore: add mkdirty, va_high_addr_switch

These new build products were left out of .gitignore, so add them now.

Link: https://lkml.kernel.org/r/20230606071637.267103-6-jhubbard@nvidia.comSigned-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

tools/testing/selftests/mm/.gitignore

@@ -40,3 +40,5 @@ local_config.mk
 ksm_functional_tests
 mdwe_test
 gup_longterm
+mkdirty
+va_high_addr_switch