net: phy: fixed_phy: remove two function stubs

Remove stubs for fixed_phy_set_link_update() and
fixed_phy_change_carrier() because all callers
(actually just one per function) select config
symbol FIXED_PHY.

Signed-off-by: Heiner Kallweit <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

include/linux/phy_fixed.h

···
 static inline void fixed_phy_unregister(struct phy_device *phydev)
 {
 }
-static inline int fixed_phy_set_link_update(struct phy_device *phydev,
-			int (*link_update)(struct net_device *,
-					   struct fixed_phy_status *))
-{
-	return -ENODEV;
-}
-static inline int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
-{
-	return -EINVAL;
-}
 #endif /* CONFIG_FIXED_PHY */
 
 #endif /* __PHY_FIXED_H */