qcacld-3.0: Fix SAP alone failed when g_sta_sap_scc_on_dfs_chan is 1

if g_sta_sap_scc_on_dfs_chan is 1, SAP can't start on DFS channel except
there is STA/P2P client on it.
When SAP start alone,  when select SAP channel after ACS, need remove DFS
channel correctly by valid check.

Change-Id: Ie500816bb0aeae3efd18767e64901bf19bedd6fc
CRs-Fixed: 3036095

core/sap/src/sap_ch_select.c

@@ -2513,6 +2513,9 @@ uint32_t sap_select_channel(mac_handle_t mac_handle,
 
 	/*Loop till get the best channel in the given range */
 	for (count = 0; count < spect_info->numSpectChans; count++) {
+		if (!spect_info->pSpectCh[count].valid)
+			continue;
+
 		best_chan_freq = spect_info->pSpectCh[count].chan_freq;
 		/* check if best_ch_num is in preferred channel list */
 		best_chan_freq =
@@ -2566,6 +2569,9 @@ next_bw:
 		for (count = 0; count < spect_info->numSpectChans; count++) {
 			struct ch_params ch_params = {0};
 
+			if (!spect_info->pSpectCh[count].valid)
+				continue;
+
 			cal_chan_freq = spect_info->pSpectCh[count].chan_freq;
 			cal_chan_weight = spect_info->pSpectCh[count].weight;
 			/* skip pcl channel whose weight is bigger than best */