[dfs] remove dfs_select.h and dfs_poll.h
@@ -1,15 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- * Change Logs:
- * Date Author Notes
- */
-
-#ifndef DFS_POLL_H__
-#define DFS_POLL_H__
-#include <poll.h>
-#endif /* DFS_POLL_H__ */
-#ifndef DFS_SELECT_H__
-#define DFS_SELECT_H__
-#include <sys/select.h>
-#endif