mac820154: move interface unregistration into iface

This patch move the iface unregistration into iface.c file to have
a behaviour which is similar like mac80211. Also iface handling should
be inside iface.c file only.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index e22f509..abb1970 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -172,5 +172,6 @@
 struct net_device *
 ieee802154_if_add(struct ieee802154_local *local, const char *name,
 		  struct wpan_dev **new_wpan_dev, int type);
+void ieee802154_remove_interfaces(struct ieee802154_local *local);
 
 #endif /* __IEEE802154_I_H */