qcacld-3.0: Fix AGO no channel switch on detect radar

AGO started on 5220Mhz with BW 160Mhz, later Radar detected and
switch to 80Mhz by sap_indicate_radar API.
Sap_indicate_radar will overwrite sap_ctx->ch_params.ch_width to 80Mhz.
After commit I26ff00286b8e0cec33d3a63098f93d4000684df0,
sap_operating_on_dfs API will use sap_ctx->ch_params to check SAP
on DFS or not to decide channel switch for current ap.
This case sap_operating_on_dfs will return "false" for current
SAP (160Mhz), and then the Radar channel switch is not processed
by driver.
Fix by using the mlme API to get current SAP channel and dfs flags.

Change-Id: I1bbcc185c13cf6e40b9f5415cbdceb7ff3527470
CRs-Fixed: 3016683

core/sap/src/sap_fsm.c

@@ -438,30 +438,24 @@ static
 bool sap_operating_on_dfs(struct mac_context *mac_ctx,
 			  struct sap_context *sap_ctx)
 {
-	uint8_t is_dfs = false;
-	uint32_t chan_freq = sap_ctx->chan_freq;
+	struct wlan_channel *chan;
 
-	if (WLAN_REG_IS_6GHZ_CHAN_FREQ(chan_freq) ||
-	    WLAN_REG_IS_24GHZ_CH_FREQ(chan_freq))
+	if (!sap_ctx->vdev) {
+		sap_debug("vdev invalid");
 		return false;
-	if (sap_ctx->ch_params.ch_width == CH_WIDTH_160MHZ) {
-		is_dfs = true;
-	} else if (sap_ctx->ch_params.ch_width == CH_WIDTH_80P80MHZ) {
-		if (wlan_reg_is_passive_or_disable_for_freq(
-						mac_ctx->pdev,
-						chan_freq) ||
-		    wlan_reg_is_passive_or_disable_for_freq(
-					mac_ctx->pdev,
-					sap_ctx->ch_params.mhz_freq_seg1 - 10))
-			is_dfs = true;
-	} else {
-		if (wlan_reg_is_passive_or_disable_for_freq(
-						mac_ctx->pdev,
-						chan_freq))
-			is_dfs = true;
 	}
 
-	return is_dfs;
+	chan = wlan_vdev_get_active_channel(sap_ctx->vdev);
+	if (!chan) {
+		sap_debug("Couldn't get vdev active channel");
+		return false;
+	}
+
+	if (chan->ch_flagext & (IEEE80211_CHAN_DFS |
+				IEEE80211_CHAN_DFS_CFREQ2))
+		return true;
+
+	return false;
 }
 
 void sap_get_cac_dur_dfs_region(struct sap_context *sap_ctx,