Remove VLLM_ASCEND_ENABLE_DENSE_OPTIMIZE (#5272)

`VLLM_ASCEND_ENABLE_DENSE_OPTIMIZE` is only used together with
`VLLM_ASCEND_ENABLE_PREFETCH_MLP` which is useless totally. This PR
remove it.
- vLLM version: release/v0.13.0
- vLLM main:
ad32e3e19c

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/envs.py

@@ -108,11 +108,6 @@ env_variables: Dict[str, Callable[[], Any]] = {
     "VLLM_ASCEND_MLP_DOWN_PREFETCH_SIZE":
     lambda: int(
         os.getenv("VLLM_ASCEND_MLP_DOWN_PREFETCH_SIZE", 18 * 1024 * 1024)),
-    # Whether to enable dense model and general optimizations for better performance.
-    # Since we modified the base parent class `linear`, this optimization is also applicable to other model types.
-    # However, there might be hidden issues, and it is currently recommended to prioritize its use with dense models.
-    "VLLM_ASCEND_ENABLE_DENSE_OPTIMIZE":
-    lambda: bool(int(os.getenv("VLLM_ASCEND_ENABLE_DENSE_OPTIMIZE", '0'))),
     # Whether to enable msMonitor tool to monitor the performance of vllm-ascend.
     "MSMONITOR_USE_DAEMON":
     lambda: bool(int(os.getenv("MSMONITOR_USE_DAEMON", '0'))),