NFSv4.1: Use more sensible names for 'initialize_mountpoint'

The initialize_mountpoint/uninitialise_mountpoint functions are really about
setting or clearing the layout driver to be used on this filesystem. Change
the names to the more descriptive 'set_layoutdriver/clear_layoutdriver'.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index cbba28c..e12367d 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -53,8 +53,8 @@
 	const u32 id;
 	const char *name;
 	struct module *owner;
-	int (*initialize_mountpoint) (struct nfs_server *);
-	int (*uninitialize_mountpoint) (struct nfs_server *);
+	int (*set_layoutdriver) (struct nfs_server *);
+	int (*clear_layoutdriver) (struct nfs_server *);
 	struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
 	void (*free_lseg) (struct pnfs_layout_segment *lseg);
 };