ieee802154, mac802154: implement devkey record option

The 802.15.4-2011 standard states that for each key, a list of devices
that use this key shall be kept. Previous patches have only considered
two options:

 * a device "uses" (or may use) all keys, rendering the list useless
 * a device is restricted to a certain set of keys

Another option would be that a device *may* use all keys, but need not
do so, and we are interested in the actual set of keys the device uses.
Recording keys used by any given device may have a noticable performance
impact and might not be needed as often. The common case, in which a
device will not switch keys too often, should still perform well.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ieee802154_netdev.h

@@ -280,6 +280,7 @@ struct ieee802154_llsec_device_key {
 enum {
 	IEEE802154_LLSEC_DEVKEY_IGNORE,
 	IEEE802154_LLSEC_DEVKEY_RESTRICT,
+	IEEE802154_LLSEC_DEVKEY_RECORD,
 
 	__IEEE802154_LLSEC_DEVKEY_MAX,
 };