[TRTLLM-5188] fix: [AutoDeploy] update output shape of prepare_fused_mha_metadata_fake#4199

lucaslie merged 2 commits intoNVIDIA:mainNVIDIA/TensorRT-LLM:mainfrom

nv-auto-deploy:user/fridah/fix-torch-optnv-auto-deploy/TensorRT-LLM:user/fridah/fix-torch-optCopy head branch name to clipboard