net: dsa: sja1105: mark as non-legacy

The sja1105 DSA driver does not have a phylink_mac_config() method
implementation, it is safe to mark this as a non-legacy driver.

Reviewed-by: Vladimir Oltean &lt;olteanv@gmail.com&gt; Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>