wifi: rtw89: 8852c: rfk: correct ADC clock settings

Some hardware modules don't have good RF characteristic as regular.
It could get ADC abnormal in low temperature, and it causes bad RX
performance and affects calibration result of DPK.

Signed-off-by: Chih-Kang Chang <gary.chang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230113090632.60957-3-pkshih@realtek.com