hotfix: ipex fails since cuda moe kernel is not supported (#2532)

Signed-off-by: Wang, Yi A <yi.a.wang@intel.com>

server/text_generation_server/models/custom_modeling/flash_deepseek_v2_modeling.py

@@ -15,7 +15,6 @@
 
 from typing import List, Optional, Tuple
 
-from moe_kernels.fused_moe import grouped_topk
 import torch
 import torch.distributed
 from text_generation_server.layers import (
@@ -41,6 +40,9 @@ from torch import nn
 from transformers.activations import ACT2FN
 from transformers.configuration_utils import PretrainedConfig
 
+if SYSTEM != "ipex":
+    from moe_kernels.fused_moe import grouped_topk
+
 if SYSTEM == "rocm":
     try:
         from vllm import _custom_C