tg3: Add 5720 PHY ID

This patch adds the 5720 PHY ID.
Signed-off-by: NMatt Carlson <mcarlson@broadcom.com>
Reviewed-by: NMichael Chan <mchan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -14673,6 +14673,7 @@ static char * __devinit tg3_phy_string(struct tg3 *tp)
 	case TG3_PHY_ID_BCM5718S:	return "5718S";
 	case TG3_PHY_ID_BCM57765:	return "57765";
 	case TG3_PHY_ID_BCM5719C:	return "5719C";
+	case TG3_PHY_ID_BCM5720C:	return "5720C";
 	case TG3_PHY_ID_BCM8002:	return "8002/serdes";
 	case 0:			return "serdes";
 	default:		return "unknown";

drivers/net/tg3.h

@@ -3035,6 +3035,7 @@ struct tg3 {
 #define TG3_PHY_ID_BCM5718S		0xbc050ff0
 #define TG3_PHY_ID_BCM57765		0x5c0d8a40
 #define TG3_PHY_ID_BCM5719C		0x5c0d8a20
+#define TG3_PHY_ID_BCM5720C		0x5c0d8b60
 #define TG3_PHY_ID_BCM5906		0xdc00ac40
 #define TG3_PHY_ID_BCM8002		0x60010140
 #define TG3_PHY_ID_INVALID		0xffffffff