ath11k: fix survey dump collection in 6 GHz

When ath11k receives survey request, choose the 6 GHz band when enabled.
Without this, survey request does not include any 6 GHz band results,
thereby causing auto channel selection to fail.

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.4.0.1-01386-QCAHKSWPL_SILICONZ-1
Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210722102054.43419-3-jouni@codeaurora.org

drivers/net/wireless/ath/ath11k/mac.c

@@ -7172,7 +7172,13 @@ static int ath11k_mac_op_get_survey(struct ieee80211_hw *hw, int idx,
 
 	if (!sband)
 		sband = hw->wiphy->bands[NL80211_BAND_5GHZ];
+	if (sband && idx >= sband->n_channels) {
+		idx -= sband->n_channels;
+		sband = NULL;
+	}
 
+	if (!sband)
+		sband = hw->wiphy->bands[NL80211_BAND_6GHZ];
 	if (!sband || idx >= sband->n_channels) {
 		ret = -ENOENT;
 		goto exit;