wifi: rtw89: 8852c: set pin MUX to enable BT firmware log

8852CE is a combo chip, and WiFi driver controls pin MUX. To output BT
firmware log to specific hardware pin, set pin MUX to achieve.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220930134417.10282-1-pkshih@realtek.com