qcacld-3.0: Do not ACS optimize on DFS channel

DFS channel always has lowest preference when do ACS
channel selection.

Change-Id: Ia551cbca90629f0fefc79d4e4647f6a4d070e3de
CRs-Fixed: 3415611

core/sap/src/sap_api_link_cntl.c

@@ -1644,6 +1644,7 @@ void wlansap_process_chan_info_event(struct sap_context *sap_ctx,
 	struct mac_context *mac;
 	struct scan_filter *filter;
 	qdf_list_t *list = NULL;
+	enum channel_state state;
 
 	mac = sap_get_mac_context();
 	if (!mac) {
@@ -1660,6 +1661,12 @@ void wlansap_process_chan_info_event(struct sap_context *sap_ctx,
 	if (WLAN_REG_IS_24GHZ_CH_FREQ(roam_info->chan_info_freq))
 		return;
 
+	state = wlan_reg_get_channel_state_for_pwrmode(
+				mac->pdev, roam_info->chan_info_freq,
+				REG_CURRENT_PWR_MODE);
+	if (state != CHANNEL_STATE_ENABLE)
+		return;
+
 	if (sap_ctx->optimize_acs_chan_selected)
 		return;
 	/* If chan_info_freq is not preferred band's freq