Delete dfs_jffs2.h

components/dfs/filesystems/jffs2/dfs_jffs2.h

-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- */
-#ifndef __DFS_JFFS2_H__
-#define __DFS_JFFS2_H__
-
-int dfs_jffs2_init(void);
-
-#endif