### What this PR does / why we need it? With this PR, we can migrate to the native `data_parallel.py` in vllm examples and remove the version in vllm-ascend. At present, `ASCEND_RT_VISIBLE_DEVICES` introduces considerable difficulties; therefore, we must employ a temporary workaround and manually specify the device. Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>