SUNRPC: Mark auth and cred operation tables as constant.

Also do the same for gss_api operation tables.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/gss_api.h b/include/linux/sunrpc/gss_api.h
index 5eca9e4..bbac101 100644
--- a/include/linux/sunrpc/gss_api.h
+++ b/include/linux/sunrpc/gss_api.h
@@ -77,7 +77,7 @@
 	struct module		*gm_owner;
 	struct xdr_netobj	gm_oid;
 	char			*gm_name;
-	struct gss_api_ops	*gm_ops;
+	const struct gss_api_ops *gm_ops;
 	/* pseudoflavors supported by this mechanism: */
 	int			gm_pf_num;
 	struct pf_desc *	gm_pfs;