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/vfs.h b/fs/nfsd/vfs.h
index f4fa6d3..4b1de0a 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -5,6 +5,8 @@
 #ifndef LINUX_NFSD_VFS_H
 #define LINUX_NFSD_VFS_H
 
+#include "nfsfh.h"
+
 /*
  * Flags for nfsd_permission
  */