example (llm): lm_eval doesn't work with GraphModules

[nickfraser]

Traceback (most recent call last):
  File "/scratch/users/nfraser/workspace/brevitas-1/src/brevitas_examples/llm/main.py", line 856, in <module>
    main(args)
  File "/scratch/users/nfraser/workspace/brevitas-1/src/brevitas_examples/llm/main.py", line 494, in main
    wrapped_model = HFLM(pretrained=model)  # need to wrap for LLM eval
                    ^^^^^^^^^^^^^^^^^^^^^^
  File "/proj/xlabs/users/nfraser/opt/miniforge3/envs/20241120_brv_hf_pt2.5.1/lib/python3.12/site-packages/lm_eval/models/huggingface.py", line 175, in __init__
    self._create_tokenizer(
  File "/proj/xlabs/users/nfraser/opt/miniforge3/envs/20241120_brv_hf_pt2.5.1/lib/python3.12/site-packages/lm_eval/models/huggingface.py", line 706, in _create_tokenizer
    model_name = self.model.name_or_path
                 ^^^^^^^^^^^^^^^^^^^^^^^
  File "/proj/xlabs/users/nfraser/opt/miniforge3/envs/20241120_brv_hf_pt2.5.1/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1931, in __getattr__
    raise AttributeError(
AttributeError: 'GraphModule' object has no attribute 'name_or_path'