[MLIR][NVVM] Fix kFactor for fp8/fp6/fp4 types in MmaSpOp verifier. Improve mma tests. (#183133) Fix an incorrect kFactor value for e4m3/e5m2, e3m2/e2m3, e2m1 types in MmaSpOp::verify(). The kFactor for these types was set to 32 but should be 16. kFactor is used to compute the expected number of operand A/B register fragments. With kFactor=32 (wrong) and the only allowed shape m16n8k64, the fragment count was incorrect. With kFactor=16 (correct), it matches the PTX ISA definition for mma.sp with fp8/fp6/fp4 A/B operands. PTX ISA reference: [https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#warp-level-matrix-instructions-sparse-mma](https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#warp-level-matrix-instructions-sparse-mma) Also improve existing MLIR dialect tests for nvvm.mma.sp.sync and add new mlir-translate tests covering mma, mma.sp, and blockscale variants.
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