mt76: mt7615: fix reading airtime statistics

- change the WTBL LMAC access function to set the mapping window only once
- use ac * 2 as offset, since each AC has separate words for rx and tx

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2020-08-18 12:44:05 +02:00
commit 68e6644bbd