### What this PR does / why we need it?
In code files such as`mooncake_connector.py`,
`vllm_config.model_config.hf_config` is used to get the LLM configs.
This approach works for LLMs, but not for multi-modal models. For
multi-modal models, `vllm_config.model_config.hf_text_config` must be
used instead to get the LLM configs.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Existing UT
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c
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Signed-off-by: ApsarasX <apsarax@outlook.com>