[5/N][Attention] Finish eliminating vllm/attention folder (#32064)

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

vllm/model_executor/models/mimo_v2_flash.py

@@ -6,7 +6,6 @@ from itertools import islice
 import torch
 from torch import nn
 
-from vllm.attention.layer import Attention
 from vllm.config import (
     CacheConfig,
     VllmConfig,
@@ -22,6 +21,7 @@ from vllm.distributed import (
 )
 from vllm.logger import init_logger
 from vllm.model_executor.layers.activation import SiluAndMul
+from vllm.model_executor.layers.attention import Attention
 from vllm.model_executor.layers.fused_moe import FusedMoE
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.linear import (