net: mac802154: Introduce a helper to disable the queue

Sometimes calling the stop queue helper is not enough because it does
not hold any lock. In order to be safe and avoid racy situations when
trying to (soon) sync the Tx queue, for instance before sending an MLME
frame, let's now introduce an helper which actually hold the necessary
locks when doing so.

Suggested-by: Alexander Aring <[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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