[P/D] check kv extra config and del hccl backend (#4547)

### What this PR does / why we need it?
check kv extra config & del hccl backend


- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

---------

Signed-off-by: liziyu <liziyu16@huawei.com>
Co-authored-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/distributed/kvpool/backend/mooncake_backend.py

@@ -83,7 +83,6 @@ class MooncakeStoreConfig:
     protocol: str
     device_name: str
     master_server_address: str
-    use_ascend_direct: bool
 
     @staticmethod
     def from_file(file_path: str) -> "MooncakeStoreConfig":
@@ -99,8 +98,7 @@ class MooncakeStoreConfig:
                                           DEFAULT_LOCAL_BUFFER_SIZE)),
             protocol=config.get("protocol", "tcp"),
             device_name=config.get("device_name", ""),
-            master_server_address=config.get("master_server_address"),
-            use_ascend_direct=config.get("use_ascend_direct", False))
+            master_server_address=config.get("master_server_address"))
 
     @staticmethod
     def load_from_env() -> "MooncakeStoreConfig":