[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/distributed/mooncake_connector.py

@@ -345,7 +345,7 @@ class KVCacheRecvingThread(threading.Thread):
         self.vllm_config = vllm_config
         self.model_config = self.vllm_config.model_config
         self.block_size = self.vllm_config.cache_config.block_size
-        self.num_layers = self.model_config.hf_config.num_hidden_layers
+        self.num_layers = self.model_config.hf_text_config.num_hidden_layers
         self.pp_layer_indices = {
             rank:
             get_prefill_pp_indices(self.num_layers, rank,