ieee802154: Add support for user beaconing requests

Parse user requests for sending beacons, start sending beacons at a
regular pace. If needed, the pace can be updated with a new request. The
process can also be interrupted at any moment.

The page and channel must be changed beforehands if needed. Interval
orders above 14 are reserved to tell a device it must answer BEACON_REQ
coming from another device as part of an active scan procedure and this
is not yet supported.

A netlink "beacon request" structure is created to list the
requirements.

Mac layers may now implement the ->send_beacons() and
->stop_beacons() hooks.

Co-developed-by: David Girault <[email protected]>
Signed-off-by: David Girault <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Acked-by: Alexander Aring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stefan Schmidt <[email protected]>

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