[SpecDecode][CI] Set default values to fix spec decode and fix multicard CI (#1109)

### What this PR does / why we need it?
- Set default values to fix spec decode
- To avoid oom, we need to run the test in a single process

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
- CI passed, espcecially multicards CI
- For spec decode test, long term CI passed

Closes: https://github.com/vllm-project/vllm-ascend/pull/1105

---------

Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
Co-authored-by: Yizhou Liu <liu_yizhou@outlook.com>
Co-authored-by: mengwei805 <mengwei25@huawei.com>

vllm_ascend/patch/worker/patch_common/patch_spec_decode_worker.py

@@ -56,6 +56,12 @@ def create_worker(
         draft_worker_kwargs.pop("ngram_prompt_lookup_max"))
     ngram_prompt_lookup_min = (
         draft_worker_kwargs.pop("ngram_prompt_lookup_min"))
+
+    # TODO(Yizhou): A quick fix, must be refactored ASAP
+    draft_worker_kwargs["vllm_config"].parallel_config.expert_parallel_size = 1
+    draft_worker_kwargs[
+        "vllm_config"].parallel_config.expert_tensor_parallel_size = 1
+
     draft_model_config = draft_worker_kwargs["vllm_config"].model_config
     draft_parallel_config: ParallelConfig = draft_worker_kwargs[
         'vllm_config'].parallel_config