tg3: Enable mult rd DMA engine on 5719

The multiple DMA read engine bugs have been fixed on the 5719.  This
patch reenables support for this feature.

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

drivers/net/tg3.c

@@ -8165,8 +8165,7 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
 		      RDMAC_MODE_FIFOURUN_ENAB | RDMAC_MODE_FIFOOREAD_ENAB |
 		      RDMAC_MODE_LNGREAD_ENAB);
 
-	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 ||
-	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719)
+	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717)
 		rdmac_mode |= RDMAC_MODE_MULT_DMA_RD_DIS;
 
 	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5784 ||