[BSP] fix compiling issue

bsp/at91sam9260/applications/application.c

@@ -31,8 +31,6 @@
 #include <rtdevice.h>
 
 #ifdef RT_USING_DFS
-/* dfs init */
-#include <dfs_init.h>
 /* dfs filesystem:ELM FatFs filesystem init */
 #include <dfs_elm.h>
 /* dfs Filesystem APIs */