parser: add parser support for io_uring mediation

io_uring rules have the following format:

io_uring [<access_mode>] [<label>],
access_mode := 'sqpoll'|'override_creds'
label := 'label' '=' <target label>

Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>

parser/parser_main.c

@@ -950,6 +950,9 @@ void set_supported_features()
 	features_supports_sysv_mqueue = features_intersect(kernel_features,
 						      policy_features,
 						      "ipc/sysv_mqueue");
+	features_supports_io_uring = features_intersect(kernel_features,
+							policy_features,
+							"io_uring");
 }
 
 static bool do_print_cache_dir(aa_features *features, int dirfd, const char *path)