Update on "[quant][graphmode][fx] Add support for additional_{fusion/…

…quant}_pattern"

Summary:
Allow user to provide additional fusion/quant patterns for fx graph mode

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Differential Revision: [D24317437](https://our.internmc.facebook.com/intern/diff/D24317437)

[ghstack-poisoned]

torch/quantization/fx/quantize.py

@@ -328,7 +328,7 @@ def _prepare(self, model, qconfig_dict, inplace, prepare_custom_config_dict, is_
         if not inplace:
             model = copy.deepcopy(model)
         additional_quant_patterns = prepare_custom_config_dict.get("additional_quant_pattern", {})
-        self.patterns = get_default_quant_patterns.copy()
+        self.patterns = get_default_quant_patterns().copy()
         for k, v in additional_quant_patterns.items():
             self.patterns[k] = v