Back out "Add XNNPACK backend option for workspace sharing"

[GregoryComer]

Summary:
Original commit changeset: 7d87b3e7ffef

Original Phabricator Diff: D76789804

Rollback Plan:

Differential Revision: D81634155

[pytorch-bot]

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❌ 6 Cancelled Jobs

As of commit 9de9d6b with merge base 4fc602b ():

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

• periodic / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)

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This pull request was exported from Phabricator. Differential Revision: D81634155

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