Adding YAMA hooks also when YAMA is not stacked.

Without this patch YAMA will not work at all if it is chosen
as the primary LSM instead of being "stacked".
Signed-off-by: Salvatore Mesoraca <s.mesoraca16@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>

security/yama/yama_lsm.c

@@ -406,6 +406,7 @@ static __init int yama_init(void)
 	 */
 	if (!security_module_enable("yama"))
 		return 0;
+	yama_add_hooks();
 #endif
 	pr_info("Yama: becoming mindful.\n");