net: dc2114x: allow users to decide whether to detect the tx No Carrier errors

Some IP cores of dc2114x or its variants do not comply so well with
the behaviors described by the official document. A packet could be
sent successfully but reported with No Carrier error. Latest drivers
of this IP core have not detect this error anymore.

Signed-off-by: Hanyuan Zhao <zhaohy22@mails.tsinghua.edu.cn>

drivers/net/dc2114x.c

@@ -371,7 +371,9 @@ static int dc21x4x_send_common(struct dc2114x_priv *priv, void *packet, int leng
 
 	if (le32_to_cpu(priv->tx_ring[priv->tx_new].status) & TD_ES) {
 		priv->tx_ring[priv->tx_new].status = 0x0;
+#if !CONFIG_IS_ENABLED(TULIP_IGNORE_TX_NO_CARRIER)
 		goto done;
+#endif
 	}
 
 	status = length;