sfc: Use generic MDIO functions and definitions

Make use of the newly-added generic MDIO clause 45 support and remove
redundant definitions.

Add an 'efx_' prefix to the remaining driver-specific MDIO functions
and remove arguments which are redundant with efx->mdio.prtad.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sfc/falcon_xmac.c b/drivers/net/sfc/falcon_xmac.c
index 5a03713..2b3269c 100644
--- a/drivers/net/sfc/falcon_xmac.c
+++ b/drivers/net/sfc/falcon_xmac.c
@@ -133,7 +133,7 @@
 	/* If the link is up, then check the phy side of the xaui link */
 	if (efx->link_up && link_ok)
 		if (efx->phy_op->mmds & (1 << MDIO_MMD_PHYXS))
-			link_ok = mdio_clause45_phyxgxs_lane_sync(efx);
+			link_ok = efx_mdio_phyxgxs_lane_sync(efx);
 
 	return link_ok;
 }