ucc_geth: enable transmit time stamping.

This patch enables software (and phy device) transmit time stamping.
Compile tested only.

Cc: Shlomi Gridish <gridish@freescale.com>
Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ucc_geth.c

@@ -3165,6 +3165,8 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	ugeth->txBd[txQ] = bd;
 
+	skb_tx_timestamp(skb);
+
 	if (ugeth->p_scheduler) {
 		ugeth->cpucount[txQ]++;
 		/* Indicate to QE that there are more Tx bds ready for