nfsd: get rid of include ../internal.h

added back in 2015 for the sake of vfs_clone_file_range(),
which is in linux/fs.h these days

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: Al Viro

fs/nfsd/vfs.c

@@ -35,7 +35,6 @@
 #include "xdr3.h"
 
 #ifdef CONFIG_NFSD_V4
-#include "../internal.h"
 #include "acl.h"
 #include "idmap.h"
 #include "xdr4.h"