[worker] remove unused assertion (#161)

### What this PR does / why we need it?
Remove unused assertion in `NPUWorker`, as this has been moved to
`Executor` in vLLM:

aabeb2688f/vllm/executor/uniproc_executor.py (L43)

### Does this PR introduce _any_ user-facing change?
N/A

### How was this patch tested?
CI passed with existing test.

Signed-off-by: MengqingCao <cmq0113@163.com>

vllm_ascend/worker.py

@@ -84,9 +84,6 @@ class NPUWorker(LocalOrDistributedWorkerBase):
         self.distributed_init_method = distributed_init_method
         self.is_driver_worker = is_driver_worker
 
-        if is_driver_worker:
-            assert rank % self.parallel_config.tensor_parallel_size == 0, \
-                   "Driver worker should be rank 0 of tensor parallel group."
         if self.model_config.trust_remote_code:
             # note: lazy import to avoid importing torch before initializing
             from vllm.utils import init_cached_hf_modules