ieee802154: move headers out of extra directory

include/net/ieee802154/af_ieee802154.h (and others) naming seems to be too long
and redundant. Drop one level of subdirectories.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index 27eda9f..a615b9d 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -27,9 +27,9 @@
 #include <net/netlink.h>
 #include <net/genetlink.h>
 #include <linux/nl802154.h>
-#include <net/ieee802154/af_ieee802154.h>
-#include <net/ieee802154/nl802154.h>
-#include <net/ieee802154/netdevice.h>
+#include <net/af_ieee802154.h>
+#include <net/nl802154.h>
+#include <net/ieee802154_netdev.h>
 
 static unsigned int ieee802154_seq_num;