perf: fix MLA split-k performance bug #898
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MasterJH5574
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This PR applies changes in flashinfer-ai#898 and flashinfer-ai#900 to the MLA TVM binding.
yzh119
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As observed in #892 , we found flashinfer mla's second stage of split-k is very slow (when batch size is small), this is because our scheduler only uses one CTA for the second stage of split-k.
This PR fixes the issue.