[Attention] Update attention imports (#29540)

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

vllm/model_executor/layers/quantization/mxfp4.py

@@ -8,6 +8,7 @@ import torch
 from torch.nn.parameter import Parameter
 
 from vllm import envs
+from vllm.attention.layer import Attention
 from vllm.config import get_current_vllm_config
 from vllm.logger import init_logger
 from vllm.model_executor.layers.fused_moe import (
@@ -184,8 +185,6 @@ class Mxfp4Config(QuantizationConfig):
     def get_quant_method(
         self, layer: torch.nn.Module, prefix: str
     ) -> Optional["QuantizeMethodBase"]:
-        from vllm.attention.layer import Attention  # Avoid circular import
-
         if isinstance(layer, LinearBase):
             if self.ignored_layers and is_layer_skipped(
                 prefix=prefix,