### What this PR does / why we need it? Add `max_num_tokens_across_dp` to AscendMetadata to fix dp This pr fixes the bug introduced by https://github.com/vllm-project/vllm-ascend/pull/1229, which add an arg `max_num_tokens_across_dp` when dp_size > 1. Signed-off-by: MengqingCao <cmq0113@163.com>