net: dsa: realtek: drop cleanup from realtek_ops

It was never used and never referenced.
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/realtek/realtek.h

@@ -91,7 +91,6 @@ struct realtek_ops {
 	int	(*detect)(struct realtek_priv *priv);
 	int	(*reset_chip)(struct realtek_priv *priv);
 	int	(*setup)(struct realtek_priv *priv);
-	void	(*cleanup)(struct realtek_priv *priv);
 	int	(*get_mib_counter)(struct realtek_priv *priv,
 				   int port,
 				   struct rtl8366_mib_counter *mib,