[ET-VK] Misc code cleanup to recent Quantized Linear + SDPA implementations

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][DCE] Remove redundant quantized linear implementations #14151
• -> [ET-VK] Misc code cleanup to recent Quantized Linear + SDPA implementations #14150

As title. Introduce some minor fixes and code cleanup to the recently added dqlinear and sdpa implementations.

Differential Revision: D82120825

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14150

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❌ 37 Cancelled Jobs, 5 Unrelated Failures

As of commit 01c55d9 with merge base 598ba46 ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / macos / macos-job (gh)
• pull / unittest-buck / macos / macos-job (gh)
• pull / unittest-editable / macos / macos-job (gh)
• trunk / test-custom-ops-macos (cmake) / macos-job (gh)
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
• trunk / test-llama-runner-mac (fp32, mps) / macos-job (gh)
• trunk / test-llama-runner-mac (fp32, xnnpack+custom+quantize_kv) / macos-job (gh)
• trunk / test-llama-torchao-lowbit / macos-job (gh)
• trunk / test-models-macos-coreml (dl3) / macos-job (gh)
• trunk / test-models-macos-coreml (edsr) / macos-job (gh)
• trunk / test-models-macos-coreml (efficient_sam) / macos-job (gh)
• trunk / test-models-macos-coreml (emformer_join) / macos-job (gh)
• trunk / test-models-macos-coreml (emformer_transcribe) / macos-job (gh)
• trunk / test-models-macos-coreml (ic3) / macos-job (gh)
• trunk / test-models-macos-coreml (ic4) / macos-job (gh)
• trunk / test-models-macos-coreml (mobilebert) / macos-job (gh)
• trunk / test-models-macos-coreml (mv2) / macos-job (gh)
• trunk / test-models-macos-coreml (mv3) / macos-job (gh)
• trunk / test-models-macos-coreml (resnet50) / macos-job (gh)
• trunk / test-models-macos-coreml (vit) / macos-job (gh)
• trunk / test-models-macos-coreml (w2l) / macos-job (gh)
• trunk / test-models-macos-cpu (efficient_sam, portable) / macos-job (gh)
• trunk / test-models-macos-cpu (emformer_join, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (ic4, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (llama, portable) / macos-job (gh)
• trunk / test-models-macos-cpu (llama2, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (llama3_2_vision_encoder, portable) / macos-job (gh)
• trunk / test-models-macos-cpu (mobilebert, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (mv3, portable) / macos-job (gh)
• trunk / test-models-macos-cpu (mv3, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (resnet50, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (vit, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-cpu (w2l, xnnpack-quantization-delegation) / macos-job (gh)
• trunk / test-models-macos-mps / macos-job (gh)
• trunk / test-selective-build-macos (cmake) / macos-job (gh)
• trunk / test-static-llama-ane / macos-job (gh)
• trunk / unittest-release / macos / macos-job (gh)

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

• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-samsung-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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This pull request was exported from Phabricator. Differential Revision: D82120825

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This pull request was exported from Phabricator. Differential Revision: D82120825