mac802154: allocation of ieee802154 device

An interface to allocate and register ieee802154 compatible device.
The allocated device has the following representation in memory:

	+-----------------------+
	| struct wpan_phy       |
	+-----------------------+
	| struct mac802154_priv |
	+-----------------------+
	| driver's private data |
	+-----------------------+

Used by device drivers to register new instance in the stack.

Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/Kconfig b/net/Kconfig
index e07272d..4c06c7c 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -211,6 +211,7 @@
 source "net/wanrouter/Kconfig"
 source "net/phonet/Kconfig"
 source "net/ieee802154/Kconfig"
+source "net/mac802154/Kconfig"
 source "net/sched/Kconfig"
 source "net/dcb/Kconfig"
 source "net/dns_resolver/Kconfig"