mt76: connac: add 6 GHz support for wtbl and starec configuration

Since there are no HT & VHT IEs being sent in 6ghz,
some capabilities judgement and parsing for wtbl &
starec configuration should be modified to reflect such changes.

Reviewed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Money Wang <Money.Wang@mediatek.com>
Signed-off-by: MeiChia Chiu <MeiChia.Chiu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>