Add landlock syscalls to whitelist in statistics

Landlock syscalls are currently tested in the landlock testing suite and
there's no reason to consider them untested, so they can be added to the
statistics whitelist.

Reviewed-by: Li Wang <liwang@redhat.com>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>

doc/conf.py

@@ -74,6 +74,9 @@ def generate_syscalls_stats(_):
         'io_uring_enter',
         'io_uring_register',
         'io_uring_setup',
+        'landlock_add_rule',
+        'landlock_create_ruleset',
+        'landlock_restrict_self',
         'lsetxattr',
         'newfstatat',
         'putmsg',