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* ggml-cuda: add flash-attn support for DKQ=320/DV=256 with ncols2=32 (GQA=32) Adds MMA-f16 and tile kernel configs, dispatch logic, template instances, and tile .cu file for Mistral Small 4 (head sizes 320/256), restricting to ncols2=32 to support GQA ratio 32 only. * Adding check to return BEST_FATTN_KERNEL_NONE in case GQA!=32 * Apply suggestions from code review Address review comments Co-authored-by: Johannes Gäßler <johannesg@5d6.de> * Address review comments and making kernel config default to DQK=512, DV=512 instead of DQK=256,DV=256 * Fixed bug with sinks=1, with ncols=32, there are two warp-groups created but sinks index is same(0,...,15) for both the groups hence with sinks=1, output is not matching with CPU output. Added sink_base which will be base index for each warp_group (threadIdx.y / np) * Apply suggestions from code review Co-authored-by: Johannes Gäßler <johannesg@5d6.de> * Update ggml/src/ggml-cuda/template-instances/generate_cu_files.py Co-authored-by: Johannes Gäßler <johannesg@5d6.de> --------- Co-authored-by: Johannes Gäßler <johannesg@5d6.de>