[Misc][V0 Deprecation] Remove V0 Attention (#1835)

### What this PR does / why we need it?
This PR is a part of
https://github.com/vllm-project/vllm-ascend/issues/1620.

- vLLM version: v0.9.2
- vLLM main:
8dfb45ca33

Signed-off-by: shen-shanshan <467638484@qq.com>

vllm_ascend/attention/mla_v1.py

@@ -15,7 +15,6 @@ from vllm.model_executor.layers.linear import (LinearBase,
 from vllm.utils import cdiv, round_down
 
 from vllm_ascend.ascend_config import get_ascend_config
-from vllm_ascend.attention.attention import _ALLOWED_NUM_QUERIES_PER_KV
 from vllm_ascend.attention.attention_v1 import AscendAttentionState
 from vllm_ascend.multistream.base import MSAttentionMetadataSplitConfig
 from vllm_ascend.multistream.context import get_multistream_comm_context
@@ -27,6 +26,8 @@ from vllm_ascend.worker.npu_input_batch import InputBatch
 if TYPE_CHECKING:
     from vllm.v1.core.sched.output import SchedulerOutput
 
+_ALLOWED_NUM_QUERIES_PER_KV = [32, 64, 128]
+
 
 @dataclass
 class CommonAttentionMetadata: