support qwen2 running on ascend npu device (#7022)

Co-authored-by: 刁莹煜 <diaoyingyu1@hisilicon.com>

python/sglang/srt/_custom_ops.py

@@ -4,7 +4,7 @@ from typing import List, Tuple
 
 import torch
 
-from sglang.srt.utils import get_bool_env_var, is_hip, is_hpu
+from sglang.srt.utils import get_bool_env_var, is_hip, is_hpu, is_npu
 
 logger = logging.getLogger(__name__)
 use_vllm_custom_allreduce = get_bool_env_var(
@@ -25,7 +25,7 @@ if not is_hpu():
             logger.warning("Failed to import from custom_ar with %r", e)
 
 
-if not is_hip():
+if not is_hip() and not is_npu():
     if use_vllm_custom_allreduce:
         custom_op = torch.ops._C_custom_ar
     else: