Revert "Patching lan78xx for SOF_TIMESTAMPING_TX_SOFTWARE support"

This reverts commit abe92ec.

Author: nbuchwitz

drivers/net/usb/lan78xx.c

@@ -1960,7 +1960,6 @@ static const struct ethtool_ops lan78xx_ethtool_ops = {
 	.set_link_ksettings = lan78xx_set_link_ksettings,
 	.get_regs_len	= lan78xx_get_regs_len,
 	.get_regs	= lan78xx_get_regs,
-	.get_ts_info    = ethtool_op_get_ts_info,
 };
 
 static int lan78xx_init_mac_address(struct lan78xx_net *dev)