[Feat]Make full graph mode compalible with MTP (#3276)

### What this PR does / why we need it?
Make the Full Graph mode can run with MTP.

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

### How was this patch tested?

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

Signed-off-by: anon189Ty <Stari_Falcon@outlook.com>

tests/ut/worker/test_worker_v1.py

@@ -448,6 +448,7 @@ class TestNPUWorker(TestBase):
             worker.compilation_config = MagicMock()
             worker.compilation_config.cudagraph_mode = MagicMock()
             mock_model_runner = MagicMock()
+            mock_decode_token_per_req = mock_model_runner.decode_token_per_req
             worker.model_runner = mock_model_runner
 
             # Test execute_dummy_batch
@@ -455,7 +456,9 @@ class TestNPUWorker(TestBase):
 
             # Verify call
             mock_model_runner._dummy_run.assert_called_once_with(
-                num_tokens=1, uniform_decode=True, force_attention=False)
+                num_tokens=mock_decode_token_per_req,
+                uniform_decode=True,
+                force_attention=False)
 
     @patch("vllm_ascend.worker.worker_v1.envs_vllm")
     @patch("vllm_ascend.worker.worker_v1.logger")