Revert "drop ascend scheduler" (#4580)

Reverts vllm-project/vllm-ascend#4498
- vLLM version: v0.11.2
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

tests/e2e/nightly/models/test_deepseek_r1_w8a8_eplb.py

@@ -71,6 +71,9 @@ async def test_models(model: str) -> None:
         "cudagraph_mode": "FULL_DECODE_ONLY"
     }
     additional_config: dict[str, Any] = {
+        "ascend_scheduler_config": {
+            "enabled": False
+        },
         "torchair_graph_config": {
             "enabled": True
         },