mt76: convert MT_TX_HW_QUEUE_EXT_PHY to MT_TX_HW_QUEUE_PHY

Report phy_indx in tx_info->hw_queue. This is a preliminary patch to add
newer chipset support

Co-developed-by: Bo Jiao <bo.jiao@mediatek.com>
Signed-off-by: Bo Jiao <bo.jiao@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>