### What this PR does / why we need it? fix bug in 1p1d disaggregated_prefill example ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Tested with python find_device_ips.py and run disaggregated_prefill example <!-- Thanks for sending a pull request! BEFORE SUBMITTING, PLEASE READ https://docs.vllm.ai/en/latest/contributing/overview.html --> Signed-off-by: wangyanhui-cmss <wangyanhui_yewu@cmss.chinamobile.com>