net: dsa: b53: mark as non-legacy

The B53 driver does not make use of the speed, duplex, pause or
advertisement in its phylink_mac_config() implementation, so it can be
marked as a non-legacy driver.
Signed-off-by: NRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/b53/b53_common.c

@@ -1346,6 +1346,12 @@ static void b53_phylink_get_caps(struct dsa_switch *ds, int port,
 	/* Get the implementation specific capabilities */
 	if (dev->ops->phylink_get_caps)
 		dev->ops->phylink_get_caps(dev, port, config);
+
+	/* This driver does not make use of the speed, duplex, pause or the
+	 * advertisement in its mac_config, so it is safe to mark this driver
+	 * as non-legacy.
+	 */
+	config->legacy_pre_march2020 = false;
 }
 
 int b53_phylink_mac_link_state(struct dsa_switch *ds, int port,