tg3: Use ext rx bds

The 5717 only uses extended buffer descriptors for the jumbo producer
ring.  Extended buffer descriptors are available on all devices that
support a separate jumbo producer ring so make the change universal.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 7a27cff..982171f 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2480,7 +2480,7 @@
 	u32				rx_std_ptr;
 	u32				rx_jmb_ptr;
 	struct tg3_rx_buffer_desc	*rx_std;
-	struct tg3_rx_buffer_desc	*rx_jmb;
+	struct tg3_ext_rx_buffer_desc	*rx_jmb;
 	struct ring_info		*rx_std_buffers;
 	struct ring_info		*rx_jmb_buffers;
 	dma_addr_t			rx_std_mapping;