tg3: 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>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Link: https://patch.msgid.link/20240906144632.404651-3-gal@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/tg3.c

@@ -6145,9 +6145,7 @@ static int tg3_get_ts_info(struct net_device *dev, struct kernel_ethtool_ts_info
 {
 	struct tg3 *tp = netdev_priv(dev);
 
-	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
-				SOF_TIMESTAMPING_RX_SOFTWARE |
-				SOF_TIMESTAMPING_SOFTWARE;
+	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE;
 
 	if (tg3_flag(tp, PTP_CAPABLE)) {
 		info->so_timestamping |= SOF_TIMESTAMPING_TX_HARDWARE |
@@ -6157,8 +6155,6 @@ static int tg3_get_ts_info(struct net_device *dev, struct kernel_ethtool_ts_info
 
 	if (tp->ptp_clock)
 		info->phc_index = ptp_clock_index(tp->ptp_clock);
-	else
-		info->phc_index = -1;
 
 	info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);