wifi: mt76: mt7925: fix wmm queue mapping

Firmware uses access class index (ACI) for wmm parameters update,
so convert mac80211 queue to ACI in mt7925_conf_tx().

Fixes: c948b5da

 ("wifi: mt76: mt7925: add Mediatek Wi-Fi7 driver for mt7925 chips")
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>