Update normalized config to grab from manager

Author: simondanielsson

optimum/exporters/onnx/model_configs.py

@@ -502,7 +502,7 @@ class GemmaOnnxConfig(LlamaOnnxConfig):
 class Gemma3OnnxConfig(LlamaOnnxConfig):
     DUMMY_INPUT_GENERATOR_CLASSES = (DummyTextInputGenerator, GemmaDummyPastKeyValuesGenerator)
     DUMMY_PKV_GENERATOR_CLASS = GemmaDummyPastKeyValuesGenerator
-    NORMALIZED_CONFIG_CLASS = NormalizedTextAndVisionConfig
+    NORMALIZED_CONFIG_CLASS = NormalizedConfigManager.get_normalized_config_class("gemma3")
     MIN_TRANSFORMERS_VERSION = version.parse("4.52.0.dev0")