ixgbe: DCB, use hardware independent routines

This consolidates hardware specifics to ixgbe_dcb.c this simplifies
code that was previously branching based on hardware type.
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe_dcb_nl.c

@@ -405,11 +405,7 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
 	if (adapter->dcb_set_bitmap & BIT_PFC) {
 		u8 pfc_en;
 		ixgbe_dcb_unpack_pfc(&adapter->dcb_cfg, &pfc_en);
-
-		if (adapter->hw.mac.type == ixgbe_mac_82598EB)
-			ixgbe_dcb_config_pfc_82598(&adapter->hw, pfc_en);
-		else if (adapter->hw.mac.type == ixgbe_mac_82599EB)
-			ixgbe_dcb_config_pfc_82599(&adapter->hw, pfc_en);
+		ixgbe_dcb_hw_pfc_config(&adapter->hw, pfc_en);
 		ret = DCB_HW_CHG;
 	}