qcacmn: Avoid un-initialized access in wifi_pos_get_ch_info

In function wifi_pos_get_ch_info initialize channel list array
before use.

Change-Id: I3b6071448fddee4aa62e833fb9bcc50aefffd7a9
CRs-Fixed: 2254723

umac/wifi_pos/src/wifi_pos_main.c

@@ -527,7 +527,7 @@ static void wifi_pos_get_ch_info(struct wlan_objmgr_psoc *psoc,
 				 struct wifi_pos_driver_caps *caps)
 {
 	uint32_t i, num_ch = 0;
-	struct regulatory_channel ch_lst[NUM_CHANNELS];
+	struct regulatory_channel ch_lst[NUM_CHANNELS] = {{0}};
 
 	wlan_objmgr_iterate_obj_list(psoc, WLAN_PDEV_OP,
 				     wifi_pos_pdev_iterator,