Split-K reduction kernel cleanup

[lessw2020]

Description

Currently this kernel is obtaining and passing in a number of strides (Triton style). Yet, these strides are not used. The kernel uses TMA and thus does not need it.
This PR simply removes the stride extraction and passing in of these un-used arguments to help showcase a cleaner CuTile kernel.

stride_att_b: ConstInt,
    stride_att_m: ConstInt,
    stride_att_s: ConstInt,
    stride_lse_rb: ConstInt,
    stride_lse_rm: ConstInt,
    stride_ob: ConstInt,
    stride_om: ConstInt,

Testing:
passes all 32 unit tests, same as before.

CI Configuration

config:
  build: true
  # valid options are "ops" and "benchmark"
  test: ["ops"]

Checklist

• Code formatted and imports sorted via repo specifications (./format.sh)
• Documentation updated (if needed)
• CI configuration reviewed

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[xjmxyt]

/ok to test e5c7ed9