net: arc_emac: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profiles

dev_consume_skb_irq() should be called in arc_emac_tx_clean() when
skb xmit done. It makes drop profiles(dropwatch, perf) more friendly.
Signed-off-by: NYang Wei <yang.wei9@zte.com.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/arc/emac_main.c

@@ -148,7 +148,7 @@ static void arc_emac_tx_clean(struct net_device *ndev)
 				 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
 
 		/* return the sk_buff to system */
-		dev_kfree_skb_irq(skb);
+		dev_consume_skb_irq(skb);
 
 		txbd->data = 0;
 		txbd->info = 0;