qcacmn: Add support to get min and max bw of chan enum

Add support to get min and max band width of provided
channel enum, so that configured bandwidth can be validated
whether it lies in the range of bandwidth or not.

Change-Id: I765b4e8013d021eaca41b37789d1ef3f1d57fa7d
CRs-Fixed: 3402928

umac/scan/dispatcher/src/wlan_scan_api.c

@@ -660,8 +660,10 @@ void wlan_scan_get_last_scan_ageout_time(struct wlan_objmgr_psoc *psoc,
 	struct wlan_scan_obj *scan_obj;
 
 	scan_obj = wlan_psoc_get_scan_obj(psoc);
-	if (!scan_obj)
+	if (!scan_obj) {
 		*last_scan_ageout_time = 0;
+		return;
+	}
 	*last_scan_ageout_time =
 	scan_obj->scan_def.last_scan_ageout_time;
 }