(fix bug): when model is quanted, arm place is append to valid places;

           remove current logic for mlu

lite/api/cxx_api.cc

@@ -316,9 +316,11 @@ void Predictor::Build(const cpp::ProgramDesc &desc,
       }
     }
   }
+#ifndef LITE_WITH_MLU
   if (is_quantized_model) {
     inner_places.emplace_back(Place{TARGET(kARM), PRECISION(kInt8)});
   }
+#endif
 
   Program program(desc, scope_, inner_places);