Revert "[sparx5] Allow restarting PTP"

This reverts commit 3c0913a.

This commit was already cherry-picked in our internal BSP, so it would
be part of the next release, therefore I will remove it from here.

Author: HoratiuVultur

drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c

@@ -307,13 +307,6 @@ static int sparx5_port_hwtstamp_set(struct net_device *dev,
 	    cfg->source != HWTSTAMP_SOURCE_PHYLIB)
 		return -EOPNOTSUPP;
 
-	if((sparx5_port->ptp_rx_cmd && cfg->rx_filter)) {
-		// Looks like timestamping doesn't get disabled by upper layers
-		// This is a quick workaround, to prevent failing, if the filters
-		// are already enabled.
-		return 0;
-	}
-
 	err = sparx5_ptp_setup_traps(sparx5_port, cfg);
 	if (err)
 		return err;