add back multi_asic check

as this original change is mainly for multi-asic production devices

scripts/portstat

@@ -337,7 +337,8 @@ class Portstat(object):
             print(table_as_json(table, header))
         else:
             print(tabulate(table, header, tablefmt='simple', stralign='right'))
-            print("\nReminder: Please execute 'show interface counters -d all' to include internal links\n")
+            if multi_asic.is_multi_asic():
+                print("\nReminder: Please execute 'show interface counters -d all' to include internal links\n")
 
     def cnstat_intf_diff_print(self, cnstat_new_dict, cnstat_old_dict, intf_list):
         """
@@ -554,7 +555,8 @@ class Portstat(object):
             print(table_as_json(table, header))
         else:
             print(tabulate(table, header, tablefmt='simple', stralign='right'))
-            print("\nReminder: Please execute 'show interface counters -d all' to include internal links\n")
+            if multi_asic.is_multi_asic():
+                print("\nReminder: Please execute 'show interface counters -d all' to include internal links\n")
 
 def main():
     parser  = argparse.ArgumentParser(description='Display the ports state and counters',