!4642 [MS][LITE][Develop]fix topkv2 parser, topkv2 have two output

Merge pull request !4642 from sunsuodong/topkv2_parser

mindspore/lite/tools/converter/parser/tflite/tflite_topk_v2_parser.cc

@@ -56,8 +56,10 @@ STATUS TfliteTopKV2Parser::Parse(const std::unique_ptr<tflite::OperatorT> &tflit
 
   AddOpInput(op, tensors_id, tensors_format, tensors_id_map,
              tflite_op->inputs[0], tensors_id->size(), tflite_tensors.size(), schema::Format_NHWC);
-  AddOpOutput(op, tensors_id, tensors_format, tensors_id_map,
-              tflite_op->outputs[0], tensors_id->size(), tflite_tensors.size(), schema::Format_NHWC);
+  for (int i = 0; i < tflite_op->outputs.size(); i++) {
+    AddOpOutput(op, tensors_id, tensors_format, tensors_id_map,
+                tflite_op->outputs[i], tensors_id->size(), tflite_tensors.size(), schema::Format_NHWC);
+  }
   return RET_OK;
 }