[Model] Pass param prefix to LLMHead (#24862)

Signed-off-by: whx-sjtu <2952154980@qq.com>

vllm/model_executor/models/zamba2.py

@@ -941,6 +941,7 @@ class Zamba2ForCausalLM(nn.Module, HasInnerState, IsHybrid):
             # We need bigger padding if using lora for kernel
             # compatibility
             if not lora_config else lora_config.lora_vocab_padding_size,
+            prefix=maybe_prefix(prefix, "lm_head"),
         )
         # Tie weights with input embeddings if using same dimensions
         self.lm_head = self.lm_head.tie_weights(self.model.embed_tokens)