[MM][Bugfix] Update hf_config to hf_text_config (#5319)

### What this PR does / why we need it?

Following https://github.com/vllm-project/vllm-ascend/pull/5205, update
`hf_config` to `hf_text_config`.

Find more details at
https://github.com/vllm-project/vllm-ascend/pull/5205#issuecomment-3675417534
and
https://github.com/vllm-project/vllm-ascend/pull/5205#issuecomment-3677920872.

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: release/v0.13.0
- vLLM main:
5fbfa8d9ef

Signed-off-by: shen-shanshan <467638484@qq.com>

vllm_ascend/eplb/utils.py

@@ -69,7 +69,7 @@ def model_register(model, model_config):
     model.get_all_moe_loads = types.MethodType(get_all_moe_loads, model)
     model.clear_all_moe_loads = types.MethodType(clear_all_moe_loads, model)
 
-    config = model_config.hf_config
+    config = model_config.hf_text_config
 
     if config.model_type == "qwen3_moe":
         model.num_moe_layers = config.num_hidden_layers