[Attention] Remove imports from vllm/attention/__init__.py (#29342)

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

vllm/model_executor/models/lfm2_moe.py

@@ -6,7 +6,7 @@ from itertools import islice
 import torch
 import torch.nn as nn
 
-from vllm.attention import Attention
+from vllm.attention.layer import Attention
 from vllm.compilation.decorators import support_torch_compile
 from vllm.config import CacheConfig, ModelConfig, VllmConfig, get_current_vllm_config
 from vllm.distributed import (