[Attention] Add head_dim=512 support for FlashInfer trtllm attention backend#38822

djmmoss wants to merge 3 commits intovllm-project:mainvllm-project/vllm:mainfrom

djmmoss:dmoss/trtllm-fmha-head-dim-512djmmoss/vllm:dmoss/trtllm-fmha-head-dim-512Copy head branch name to clipboard