[torchao] revert to get_apply_tensor_subclass (#36849)

* revert to old name

* empty commit

---------

Co-authored-by: Mohamed Mekkouri <93391238+MekkCyber@users.noreply.github.com>

src/transformers/utils/quantization_config.py

@@ -1595,7 +1595,7 @@ class TorchAoConfig(QuantizationConfigMixin):
             "autoquant": autoquant,
         }
 
-    def get_quantize_config(self):
+    def get_apply_tensor_subclass(self):
         """Create the appropriate quantization method based on configuration."""
         if isinstance(self.quant_type, str):
             methods = self._get_torchao_quant_type_to_method()