drivers/net: Remove CONFIG_WIZNET_TX_FLOW option

This option was there for debugging race conditions,
just remove it, and assume TX_FLOW is always enabled.

Signed-off-by: Mike Sinkovsky <msink@permonline.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/wiznet/w5300.c b/drivers/net/ethernet/wiznet/w5300.c
index 88afde9..7bede7f 100644
--- a/drivers/net/ethernet/wiznet/w5300.c
+++ b/drivers/net/ethernet/wiznet/w5300.c
@@ -273,9 +273,7 @@
 			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
 	mmiowb();
 	w5300_command(priv, S0_CR_OPEN);
-	w5300_write(priv, W5300_S0_IMR, IS_ENABLED(CONFIG_WIZNET_TX_FLOW) ?
-					S0_IR_RECV | S0_IR_SENDOK :
-					S0_IR_RECV);
+	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
 	w5300_write(priv, W5300_IMR, IR_S0);
 	mmiowb();
 }
@@ -371,8 +369,7 @@
 {
 	struct w5300_priv *priv = netdev_priv(ndev);
 
-	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW))
-		netif_stop_queue(ndev);
+	netif_stop_queue(ndev);
 
 	w5300_write_frame(priv, skb->data, skb->len);
 	mmiowb();
@@ -439,7 +436,7 @@
 	w5300_write(priv, W5300_S0_IR, ir);
 	mmiowb();
 
-	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW) && (ir & S0_IR_SENDOK)) {
+	if (ir & S0_IR_SENDOK) {
 		netif_dbg(priv, tx_done, ndev, "tx done\n");
 		netif_wake_queue(ndev);
 	}