Conv1d channel last bug fix (#18259)

[rezaasjd]

Summary:

Fixes Conv1d channel las indexing issue.

Reviewed By: mcremon-meta

Differential Revision: D97009237

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18259

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⏳ 3 Pending, 3 Unrelated Failures

As of commit 4c44d9b with merge base eb92cec ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@rezaasjd has exported this pull request. If you are a Meta employee, you can view the originating Diff in D97009237.

[github-actions]

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[JakeStevens]

LGTM + @mcremon-meta approved internally