Remove split_k kernel

[msaroufim]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1816

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❌ 2 New Failures

As of commit ad99507 with merge base 7963f9c ():

NEW FAILURES - The following jobs have failed:

• Run Regression Tests / test (CUDA 2.4, linux.g5.12xlarge.nvidia.gpu, torch==2.4.0, cuda, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t db3c31f9589a66bd6d4947dc124ba2d06e98b4f42bda0696f8ccc49b40a1aa44 /exec failed with exit code 1
• Run Regression Tests / test (CUDA 2.5.1, linux.g5.12xlarge.nvidia.gpu, torch==2.5.1 --index-url https://download.pytorch... / linux-job (gh)
  RuntimeError: Command docker exec -t 6c02ad379e911fe05bfbaca3b07dfbbf3399303bd2bfbf7cfb89474992fe146b /exec failed with exit code 1

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