dongle_infrastructure: use define-like variable for strncmp rather than string

dongle_infrastructure.c

@@ -1850,8 +1850,7 @@ struct ubus_object *dongle_create_dynamic_object(struct dongle_container *dev)
 	debug_print("object name %s\n", obj->name);
 
 	dynamic_methods = obj_methods;
-
-	if (strncmp(dev->usb.if_name, "eth5", 5) == 0) {
+	if (strncmp(dev->usb.if_name, HILINK, 5) == 0) {
 		dynamic_methods[11].policy = create_apn_policy_huawei;
 		dynamic_methods[11].n_policy = ARRAY_SIZE(create_apn_policy_huawei);
 	}