wifi: rtw89: modify the register setting and the flow of CFO tracking

The register address used for CFO(carrier frequency offset) tracking is
different from WiFi 7 series, so we change the way to access it. And we
refine the flow of CFO tracking to compatible all WiFi 7 and 6 ICs.

Signed-off-by: Cheng-Chieh Hsieh <cj.hsieh@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/20231016065115.751662-4-pkshih@realtek.com