ieee802154: add nl802154 framework

This patch adds a basic nl802154 framework. Most of this code was
grabbed from nl80211 framework.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/ieee802154/ieee802154.h b/net/ieee802154/ieee802154.h
index 42ae63a..a5d7515 100644
--- a/net/ieee802154/ieee802154.h
+++ b/net/ieee802154/ieee802154.h
@@ -15,7 +15,7 @@
 #define IEEE_802154_LOCAL_H
 
 int __init ieee802154_nl_init(void);
-void __exit ieee802154_nl_exit(void);
+void ieee802154_nl_exit(void);
 
 #define IEEE802154_OP(_cmd, _func)			\
 	{						\