net: mac802154: Remove unused ieee802154_mlme_tx_one

net: mac802154: Remove unused ieee802154_mlme_tx_one

ieee802154_mlme_tx_one() was added in 2022 by
commit ddd9ee7cda12 ("net: mac802154: Introduce a synchronous API for MLME
commands") but has remained unused.

Remove it.

Note, there's still a ieee802154_mlme_tx_one_locked()
variant that is used.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/20241225012423.439229-1-linux@treblig.org
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>