### What this PR does / why we need it? when infer deepseek mtp layer with multistream_moe, we should pass a boolean to evaluate this feature and fix bugs when we are in mtp layer - vLLM version: v0.11.0rc3 - vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0 --------- Signed-off-by: zouyida2052 <zouyida2002@gmail.com>