net: mscc: ocelot: delete unused ocelot_set_cpu_port prototype

This is a leftover of commit 69df578c ("net: mscc: ocelot: eliminate
confusion between CPU and NPI port") which renamed that function.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mscc/ocelot.h

@@ -122,10 +122,6 @@ void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg);
 int ocelot_probe_port(struct ocelot *ocelot, int port, struct regmap *target,
 		      struct phy_device *phy);
 
-void ocelot_set_cpu_port(struct ocelot *ocelot, int cpu,
-			 enum ocelot_tag_prefix injection,
-			 enum ocelot_tag_prefix extraction);
-
 extern struct notifier_block ocelot_netdevice_nb;
 extern struct notifier_block ocelot_switchdev_nb;
 extern struct notifier_block ocelot_switchdev_blocking_nb;