Fix test_llama

[jackzhxng]

Stack from ghstack (oldest at bottom):

• Completely remove args from export_llama_lib #11171
• refactor: simplify Llama2Model constructor to take llm_config directly #11170
• refactor: remove backward compatibility and simplify Llama2Model configuration #11169
• refactor: Use LlmConfig for model parameters instead of kwargs #11168
• fix: add missing LlmConfig import and parameter in export_llama_lib.py #11167
• refactor: Replace self.args with LlmConfig in model.py and export_llama_lib.py #11166
• -> Fix test_llama #11165
• Use llm_config instead of args in export_llama functions #11162
• Convert args to LlmConfig #11081
• Introduce hydra framework with backwards compatibility #11029
• Add new export LLM config #11028

[pytorch-bot]

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