wifi: rtw89: refine rtw89_correct_cck_chan() by rtw89_hw_to_nl80211_band()

In rtw89_correct_cck_chan(), we turn to use rtw89_hw_to_nl80211_band().
The difference between rtw89_hw_to_nl80211_band() and the original raw
judgement is the case on 6 GHz. Since rtw89_correct_cck_chan() is common
code independent on chip, if runtime chip doesn't support 6 GHz, it is
probably safe. Otherwise, it might not.
Signed-off-by: Zong-Zhe Yang <kevin_yang@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/20230816082133.57474-3-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -1659,8 +1659,7 @@ static void rtw89_correct_cck_chan(struct rtw89_dev *rtwdev,
 	const struct rtw89_chan_rcd *rcd =
 		rtw89_chan_rcd_get(rtwdev, RTW89_SUB_ENTITY_0);
 	u16 chan = rcd->prev_primary_channel;
-	u8 band = rcd->prev_band_type == RTW89_BAND_2G ?
-		  NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
+	u8 band = rtw89_hw_to_nl80211_band(rcd->prev_band_type);
 
 	if (status->band != NL80211_BAND_2GHZ &&
 	    status->encoding == RX_ENC_LEGACY &&