nfsd: move most of nfsfh.h to fs/nfsd

Most of this can be trivially moved to a private header as well.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/xdr.h b/fs/nfsd/xdr.h
index 235ee5c..87fe6f6 100644
--- a/fs/nfsd/xdr.h
+++ b/fs/nfsd/xdr.h
@@ -9,6 +9,7 @@
 
 #include <linux/vfs.h>
 #include "nfsd.h"
+#include "nfsfh.h"
 
 struct nfsd_fhandle {
 	struct svc_fh		fh;