[Feat][Graph] Support MTP for ACL Graph (#2932)

### What this PR does / why we need it?
This PR depends on the merge of #2707 and has adapted the aclgraph
functionality to support MTP.

### How was this patch tested?


- vLLM version: v0.10.2
- vLLM main:
2b85697031

---------

Signed-off-by: xuyexiong <xuyexiong@huawei.com>

vllm_ascend/torchair/torchair_model_runner.py

@@ -52,6 +52,10 @@ class NPUTorchairModelRunner(NPUModelRunner):
         ascend_config = get_ascend_config()
         self.enable_shared_expert_dp = ascend_config.enable_shared_expert_dp
         super().__init__(vllm_config, device)
+        if self.speculative_config:
+            self.actual_seq_lengths_q = list(
+                range(self.decode_token_per_req, self.max_num_tokens + 1,
+                      self.decode_token_per_req))
         self.attn_metadata_builder = self.attn_backend.get_builder_cls()(
             None, None, vllm_config, device)