gianfar: 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>
Link: https://patch.msgid.link/20240901112803.212753-14-gal@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/freescale/gianfar_ethtool.c

@@ -1455,12 +1455,8 @@ static int gfar_get_ts_info(struct net_device *dev,
 	struct device_node *ptp_node;
 	struct ptp_qoriq *ptp = NULL;
 
-	info->phc_index = -1;
-
 	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_TIMER)) {
-		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
-					SOF_TIMESTAMPING_TX_SOFTWARE |
-					SOF_TIMESTAMPING_SOFTWARE;
+		info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE;
 		return 0;
 	}
 
@@ -1478,9 +1474,7 @@ static int gfar_get_ts_info(struct net_device *dev,
 	info->so_timestamping = SOF_TIMESTAMPING_TX_HARDWARE |
 				SOF_TIMESTAMPING_RX_HARDWARE |
 				SOF_TIMESTAMPING_RAW_HARDWARE |
-				SOF_TIMESTAMPING_RX_SOFTWARE |
-				SOF_TIMESTAMPING_TX_SOFTWARE |
-				SOF_TIMESTAMPING_SOFTWARE;
+				SOF_TIMESTAMPING_TX_SOFTWARE;
 	info->tx_types = (1 << HWTSTAMP_TX_OFF) |
 			 (1 << HWTSTAMP_TX_ON);
 	info->rx_filters = (1 << HWTSTAMP_FILTER_NONE) |