[Bugfix][V1] Fix wrong import in V1 worker (#498)

### What this PR does / why we need it?
Fix wrong import in V1 worker.

---------

Signed-off-by: shen-shanshan <467638484@qq.com>

Author: shen-shanshan

vllm_ascend/worker/worker_v1.py

@@ -21,7 +21,6 @@
 from typing import Dict, List, Optional
 
 import torch
-import torch.distributed
 import torch.nn as nn
 import torch_npu
 from vllm import envs
@@ -32,12 +31,12 @@
 from vllm.logger import init_logger
 from vllm.model_executor import set_random_seed
 from vllm.platforms import current_platform
-from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE
+from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, GiB_bytes
 from vllm.v1.core.scheduler import SchedulerOutput
 from vllm.v1.kv_cache_interface import (FullAttentionSpec, KVCacheConfig,
                                         KVCacheSpec)
 from vllm.v1.outputs import ModelRunnerOutput
-from vllm.v1.utils import GiB_bytes, bind_kv_cache
+from vllm.v1.utils import bind_kv_cache
 from vllm.v1.worker.worker_base import WorkerBase
 
 from vllm_ascend.device_allocator.camem import CaMemAllocator