tg3: Enable GRO by default.

This was merely an oversight when I added the *_gro_receive()
calls.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 0fea685..7724d7e 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -12993,6 +12993,7 @@
 		tp->dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
 		if (tp->tg3_flags3 & TG3_FLG3_5755_PLUS)
 			tp->dev->features |= NETIF_F_IPV6_CSUM;
+		tp->dev->features |= NETIF_F_GRO;
 	}
 
 	/* Determine TSO capabilities */