rtw88: fix NSS of hw_cap

8822C is a 2x2 11ac chip, and then NSS must be less or equal to 2. However,
current nss of hw cap is 3, likes
	hw cap: hci=0x0f, bw=0x07, ptcl=0x03, ant_num=7, nss=3

This commit adds constraint to make sure NSS <= rf_path_num, and result
looks like
	hw cap: hci=0x0f, bw=0x07, ptcl=0x03, ant_num=7, nss=2

Fixes: e3037485 ("rtw88: new Realtek 802.11ac driver")
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtw88/main.c

@@ -1077,7 +1077,8 @@ static int rtw_dump_hw_feature(struct rtw_dev *rtwdev)
 
 	rtw_hw_config_rf_ant_num(rtwdev, efuse->hw_cap.ant_num);
 
-	if (efuse->hw_cap.nss == EFUSE_HW_CAP_IGNORE)
+	if (efuse->hw_cap.nss == EFUSE_HW_CAP_IGNORE ||
+	    efuse->hw_cap.nss > rtwdev->hal.rf_path_num)
 		efuse->hw_cap.nss = rtwdev->hal.rf_path_num;
 
 	rtw_dbg(rtwdev, RTW_DBG_EFUSE,