Revert "Two-pass optimization for channelwise gated delta rule kernel (#21020)"

[metascroy]

Reverts #21020

This breaks unittest macos / linux

[pytorch-bot]

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• Unrelated MacOS MPS test jobs time out (30 min) due to stale cpp_extension lock file poisoning self-hosted runners

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As of commit 2db1df6 with merge base 7f5c264 ():
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