[BNX2]: Enable new tx ring.

Enable new tx ring and add new MSIX handler and NAPI poll function
for the new tx ring.  Enable MSIX when the hardware supports it.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.h

@@ -6528,7 +6528,7 @@ struct flash_spec {
 };
 
 #define BNX2_MAX_MSIX_HW_VEC	9
-#define BNX2_MAX_MSIX_VEC	1
+#define BNX2_MAX_MSIX_VEC	2
 #define BNX2_BASE_VEC		0
 #define BNX2_TX_VEC		1
 #define BNX2_TX_INT_NUM	(BNX2_TX_VEC << BNX2_PCICFG_INT_ACK_CMD_INT_NUM_SHIFT)