ixp4xx_eth: Remove setting of RX software timestamp

The responsibility for reporting of RX software timestamp has moved to
the core layer (see __ethtool_get_ts_info()), remove usage from the
device drivers.
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Signed-off-by: Gal Pressman <gal@nvidia.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/20240906144632.404651-16-gal@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/xscale/ixp4xx_eth.c

@@ -1026,9 +1026,7 @@ static int ixp4xx_get_ts_info(struct net_device *dev,
 
 	if (info->phc_index < 0) {
 		info->so_timestamping =
-			SOF_TIMESTAMPING_TX_SOFTWARE |
-			SOF_TIMESTAMPING_RX_SOFTWARE |
-			SOF_TIMESTAMPING_SOFTWARE;
+			SOF_TIMESTAMPING_TX_SOFTWARE;
 		return 0;
 	}
 	info->so_timestamping =