rtw89: 8852c: add set channel function of RF part

Prepare functions to configure channel and bandwidth accordingly.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220414062027.62638-10-pkshih@realtek.com