[MobileNet-v2] Fix ONNX typo (#20860)

* fix typo `onnx`

* fix test

tests/onnx/test_onnx_v2.py

@@ -272,7 +272,12 @@ def _get_models_to_test(export_models_list):
                     feature: FeaturesManager.get_config(name, feature) for _ in features for feature in _
                 }
             else:
-                feature_config_mapping = FeaturesManager.get_supported_features_for_model_type(name)
+                # pre-process the model names
+                model_type = name.replace("_", "-")
+                model_name = getattr(model, "name", "")
+                feature_config_mapping = FeaturesManager.get_supported_features_for_model_type(
+                    model_type, model_name=model_name
+                )
 
             for feature, onnx_config_class_constructor in feature_config_mapping.items():
                 models_to_test.append((f"{name}_{feature}", name, model, feature, onnx_config_class_constructor))