reverse reduce precision support int64 to int32

mindspore/ccsrc/runtime/device/ascend/kernel_select_ascend.cc

@@ -183,12 +183,6 @@ void AddSupportMixedPrecisionDataTypeIndex(TypeId data_type, std::vector<int> *s
     case kNumberTypeFloat:
       index = 1;
       break;
-    case kNumberTypeInt32:
-      index = 0;
-      break;
-    case kNumberTypeInt64:
-      index = 1;
-      break;
     default:
       break;
   }