[Bugfix] Split attention groups by num_heads_q for spec-decode drafts#43543

Isotr0py merged 3 commits into

vllm-project:mainvllm-project/vllm:mainfrom

lucianommartins:lucianommartins/gemma4-fix-mtplucianommartins/my-vllm:lucianommartins/gemma4-fix-mtpCopy head branch name to clipboard