qcacld-3.0: Invalid ADDROAMSCANCHANNELS if specific channels configured

For roam scanning, "specific channels list" is preferred over
"preferred channel list". Hence if user configured specific channels
then return invalid for ADDROAMSCANCHANNLES command.

Change-Id: I858eef5c990cedb4b12c21c1a00f34ff6b819849
CRs-Fixed: 3014609

components/umac/mlme/connection_mgr/dispatcher/src/wlan_cm_roam_api.c

@@ -1095,6 +1095,7 @@ wlan_cm_roam_cfg_set_value(struct wlan_objmgr_psoc *psoc, uint8_t vdev_id,
 	case ROAM_PREFERRED_CHAN:
 		if (dst_cfg->specific_chan_info.num_chan) {
 			mlme_err("Specific channel list is already configured");
+			status = QDF_STATUS_E_INVAL;
 			break;
 		}
 		status = cm_update_roam_scan_channel_list(vdev_id,