igc: Fix MAX_ETYPE_FILTER value

The I225 controller has 8 ethertype filters, not 4. This patch fixes the
MAX_ETYPE_FILTER macro accordingly.
Signed-off-by: NAndre Guedes <andre.guedes@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igc/igc.h

@@ -26,7 +26,7 @@ void igc_set_ethtool_ops(struct net_device *);
 #define MAX_Q_VECTORS			8
 #define MAX_STD_JUMBO_FRAME_SIZE	9216
 
-#define MAX_ETYPE_FILTER		4
+#define MAX_ETYPE_FILTER		8
 #define IGC_RETA_SIZE			128
 
 struct igc_tx_queue_stats {