wifi: rtw89: mcc: support courtesy mechanism on both roles at the same time

MCC has a courtesy mechanism which allows one role to use another's
duration in a given cycle. Originally, this courtesy mechanism only
supports in one direction. However, in some field cases, both of MCC
roles may simultaneously have timing configurations that are not good
enough. So, support courtesy mechanism in both directions.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250422014620.18421-11-pkshih@realtek.com