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* xFormer updates to fMHA FW * Convert format to BMHK for '41_fused_multi_head_attention_fixed_seqlen' * Add missing files * Remove xFormers specific code * Update fused_multihead_attention_fixed_seqlen.cu * rebase and solve conflicts * remove white space --------- Co-authored-by: danthe3rd <danthe3rd> Co-authored-by: Haicheng Wu <haichengw@nvidia.com>