wifi: rtw89: chan: tweak weight recalc ahead before MLO

Originally, we consider weight only based on how many chanctxs that
mac80211 sets. However, we need to consider both active chanctxs and
active interfaces to distinguish MCC (multiple channel concurrent)
from impending MLO.

Although the logic of handling is extended, for now, behavior might
not be different under current condition.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240206030624.23382-5-pkshih@realtek.com