sfc: make function tables const

The phy, mac, and board information structures should be const.
Since tables contain function pointer this improves security
(at least theoretically).

Compile tested only.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sfc/tenxpress.c b/drivers/net/sfc/tenxpress.c
index efdceb3..204ecda 100644
--- a/drivers/net/sfc/tenxpress.c
+++ b/drivers/net/sfc/tenxpress.c
@@ -478,7 +478,7 @@
 			  advertising & ADVERTISED_10000baseT_Full);
 }
 
-struct efx_phy_operations falcon_sfx7101_phy_ops = {
+const struct efx_phy_operations falcon_sfx7101_phy_ops = {
 	.probe		  = tenxpress_phy_probe,
 	.init             = tenxpress_phy_init,
 	.reconfigure      = tenxpress_phy_reconfigure,