manager: Add the ability to get a list of active managers

kernel/apk_sign.h

@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include "ksu.h"
+#include "manager.h"
 
 bool is_manager_apk(char *path);
 
@@ -23,6 +24,7 @@ void ksu_add_manager(uid_t uid, int signature_index);
 void ksu_remove_manager(uid_t uid);
 bool ksu_is_any_manager(uid_t uid);
 int ksu_get_manager_signature_index(uid_t uid);
+int ksu_get_active_managers(struct manager_list_info *info);
 
 int ksu_handle_dynamic_sign(struct dynamic_sign_user_config *config);
 void ksu_dynamic_sign_init(void);