b154a8e22c
### What this PR does / why we need it? Fix 3 bugs in flash comm1 of Allgather EP(https://github.com/vllm-project/vllm-ascend/pull/3334): 1. call `enable_sp()` with argument `vllm_config` trigger a lot of warning log, this PR caches its return value. 2. `num_tokens_after_padding` should be cpu tensor as it will used as `num_tokens_across_dp_cpu` in `DPMetadata`. It will causes may d2h copy when running model. 3. In PD, model runner will execute `kv_connector_no_forward`，where `num_tokens` is None - vLLM version: v0.11.0rc3 - vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0 --------- Signed-off-by: realliujiaxu <realliujiaxu@163.com>