ieee802154: Remove ieee802154_reduced_mlme_ops references.

As there doesn't seem to be a definition of it or any users of it.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/ieee802154_netdev.h

@@ -430,10 +430,4 @@ ieee802154_mlme_ops(const struct net_device *dev)
 	return dev->ml_priv;
 }
 
-static inline struct ieee802154_reduced_mlme_ops *
-ieee802154_reduced_mlme_ops(const struct net_device *dev)
-{
-	return dev->ml_priv;
-}
-
 #endif