wifi: mt76: mt7925: fix get wrong chip cap from incorrect pointer

Use tlv instead of skb, because using skb will get valid data
with wrong offset.

Fixes: 86c051f2 ("wifi: mt76: mt7925: enabling MLO when the firmware supports it")
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Link: https://patch.msgid.link/20241104051447.4286-1-mingyen.hsieh@mediatek.com


Signed-off-by: Felix Fietkau <nbd@nbd.name>