Fix post training apis broken by torchtune release (#674)

There is a torchtune release this morning
https://github.com/pytorch/torchtune/releases/tag/v0.5.0 and breaks post
training apis

## test 
spinning up server and the post training works again after the fix 
<img width="1314" alt="Screenshot 2024-12-20 at 4 08 54 PM"
src="https://github.com/user-attachments/assets/dfae724d-ebf0-4846-9715-096efa060cee"
/>


## Note
We need to think hard of how to avoid this happen again and have a fast
follow up on this after holidays

llama_stack/providers/inline/post_training/torchtune/recipes/lora_finetuning_single_device.py

@@ -43,7 +43,6 @@
     get_adapter_state_dict,
     get_lora_module_names,
     get_merged_lora_ckpt,
-    load_dora_magnitudes,
     set_trainable_params,
     validate_missing_and_unexpected_for_lora,
 )
@@ -281,7 +280,6 @@ async def _setup_model(
             for m in model.modules():
                 if hasattr(m, "initialize_dora_magnitude"):
                     m.initialize_dora_magnitude()
-            load_dora_magnitudes(model)
         if lora_weights_state_dict:
             lora_missing, lora_unexpected = model.load_state_dict(
                 lora_weights_state_dict, strict=False