ixgbe: add define for X557 PHY ID

Add a define for the new PHY identification as well as it's mapping
to the correct PHY type.  Also allow ethtool to identify this type
as well.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 8f9334d..47ac0bc 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -356,6 +356,9 @@
 	case ATH_PHY_ID:
 		phy_type = ixgbe_phy_nl;
 		break;
+	case X557_PHY_ID:
+		phy_type = ixgbe_phy_x550em_ext_t;
+		break;
 	default:
 		phy_type = ixgbe_phy_unknown;
 		break;