[BugFix]Fix incorrect get_current_vllm_config (#5121)

### What this PR does / why we need it?
This PR fixes some incorrect `get_current_vllm_config` calling, which
creates empty vllm_config instead.

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

### How was this patch tested?

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

---------

Signed-off-by: Angazenn <supperccell@163.com>

vllm_ascend/attention/utils.py

@@ -1,10 +1,9 @@
 from dataclasses import dataclass
-from functools import lru_cache
 from typing import Any, List, Optional
 
 import torch
 import torch.nn.functional as F
-from vllm.config import get_current_vllm_config
+from vllm.config import VllmConfig
 from vllm.distributed.kv_transfer import (get_kv_transfer_group,
                                           has_kv_transfer_group,
                                           is_v1_kv_transfer_group)
@@ -14,9 +13,7 @@ from vllm_ascend.utils import (AscendDeviceType, get_ascend_config,
                                get_ascend_device_type)
 
 
-@lru_cache
-def using_paged_attention(runtime_shape: int) -> bool:
-    vllm_config = get_current_vllm_config()
+def using_paged_attention(runtime_shape: int, vllm_config: VllmConfig) -> bool:
     if vllm_config.speculative_config is not None:
         return False
     if get_ascend_device_type() == AscendDeviceType.A5: