mt76: mt7915: overwrite qid for non-bufferable mgmt frames

Overwrite hw queue id for non-bufferable management frames if the hw/fw
support always txq (altxq) in order to be in sync with mac txwi code

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>