Merge pull request #875 from ArdaFu/master

[DFS][NFS] Fix compile error. Move nfs_file/nfs_dir data ptr into struct nfs_filesystem

bsp/simulator/applications/init.c

@@ -38,7 +38,7 @@ extern void lwip_system_init(void);
 #endif
 
 #ifdef RT_USING_DFS
-#include <dfs_init.h>
+#include <dfs.h>
 #include <dfs_fs.h>
 #ifdef RT_USING_DFS_ELMFAT
 #include <dfs_elm.h>