Qualcomm AI Engine Direct - Remove unused callable dataset branch

[DannyYuyang-quic]

Summary

• Drop Callable from the type hint and docstring, and remove the dead callable(dataset) branch in _ptq_calibrate.

Test plan

General CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21461

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❌ You can merge normally! (2 Unrelated Failures), 1 Unclassified Failure

As of commit 29f1f24 with merge base 80925df ():

UNCLASSIFIED FAILURE - DrCI could not classify the following job because the workflow did not run on the merge base. The failure may be pre-existing on trunk or introduced by this PR:

• periodic (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / unittest / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / unittest-editable / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[DannyYuyang-quic]

@pytorchbot label "release notes: qualcomm"

[DannyYuyang-quic]

@psiddh Hi, Callable dataset was never usable, input = dataset[0] at torch.export.export would crash first so the branch was dead code and the type hint was misleading; removed both.