wifi: mt76: mt7996: enable PPDU-TxS to host

Enable PPDU TxS by default. This makes the driver able to get Tx rate
information from TxS. The driver will also refresh BA session timer
on receive of PPDU TxS when WED is on.

Signed-off-by: Yi-Chia Hsieh <yi-chia.hsieh@mediatek.com>
Signed-off-by: Money Wang <Money.Wang@mediatek.com>
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>