[Bugfix] Fix imports for MoE on CPU (#15841)

Signed-off-by: Thien Tran <gau.nernst@yahoo.com.sg>

vllm/model_executor/layers/fused_moe/rocm_aiter_fused_moe.py

@@ -4,8 +4,6 @@ from typing import List, Optional
 import torch
 
 import vllm.envs as envs
-from vllm.model_executor.layers.quantization.utils.fp8_utils import (
-    per_token_group_quant_fp8)
 from vllm.platforms import current_platform
 
 
@@ -38,6 +36,9 @@ def rocm_aiter_fused_experts(
     import aiter as rocm_aiter
     import aiter.fused_moe_bf16_asm as rocm_aiter_asm_fmoe
 
+    from vllm.model_executor.layers.quantization.utils.fp8_utils import (
+        per_token_group_quant_fp8)
+
     if envs.VLLM_ROCM_USE_AITER_FP8_BLOCK_SCALED_MOE and use_fp8_w8a8:
         assert w1_scale is not None
         assert w2_scale is not None