[1/N][Attention] Restructure attention: move files (#31916)

Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>

vllm/model_executor/models/openpangu.py

@@ -30,7 +30,6 @@ from torch import nn
 from transformers import PretrainedConfig
 
 from vllm.attention.layer import Attention, AttentionType
-from vllm.attention.layers.static_sink_attention import StaticSinkAttention
 from vllm.compilation.decorators import support_torch_compile
 from vllm.config import CacheConfig, ParallelConfig, VllmConfig
 from vllm.distributed import (
@@ -42,6 +41,9 @@ from vllm.distributed import (
     tensor_model_parallel_all_gather,
 )
 from vllm.model_executor.layers.activation import SiluAndMul
+from vllm.model_executor.layers.attention.static_sink_attention import (
+    StaticSinkAttention,
+)
 from vllm.model_executor.layers.fused_moe import SharedFusedMoE
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.linear import (