tg3: Add 57788, remove 57720

This patch adds support for the 57788 and removes support for the 57720
which was never released.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index bb8591e..636008c 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -43,7 +43,7 @@
 #define  TG3PCI_DEVICE_TIGON3_57780	 0x1692
 #define  TG3PCI_DEVICE_TIGON3_57760	 0x1690
 #define  TG3PCI_DEVICE_TIGON3_57790	 0x1694
-#define  TG3PCI_DEVICE_TIGON3_57720	 0x168c
+#define  TG3PCI_DEVICE_TIGON3_57788	 0x1691
 /* 0x04 --> 0x64 unused */
 #define TG3PCI_MSI_DATA			0x00000064
 /* 0x66 --> 0x68 unused */