wifi: rtw89: coex: Set Bluetooth scan low-priority when Wi-Fi link/scan

To avoid Bluetooth reconnecting/pairing fail during Wi-Fi is link/scan,
especially the Bluetooth connect event after the platform restart/boot up.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20231218061341.51255-8-pkshih@realtek.com