1.remove redundant headfile in kernel, such as:
  compiler.h;debug.h;automount.h;inode.h;syslog.h;net.h;
2.split fs.h to file.h and driver.h
3.move vnode.h and path_cache.h to vfs/include
4.remove redundant interface and defines

close: #I3RTNR
Signed-off-by: Nmucor <mucorwang@gmail.com>

Change-Id: Iae871ce706bef622350954601de615c7b79046a5

1. Before formating, user los_disk_cache_clear to clear the Bcache;
2. FATFS readdir use dir_read_massive to use the Bcache write block to improve readdir performance

Change-Id: I2820b86f533377b40b823e45e5c8734e8f115c7f

Reviewed-by: shenwei