### What this PR does / why we need it? shared expert dp for deepseek and deepseek_mtp, could be combined with sp to improve performance. ### How was this patch tested? - vLLM version: v0.11.0rc3 - vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0 --------- Signed-off-by: zhaozx-cn <zhaozx2116@163.com> Co-authored-by: realliujiaxu <realliujiaxu@163.com>