Remove mkldnn flag

[ethansfng]

Differential Revision: D77893838

[pytorch-bot]

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✅ You can merge normally! (2 Unrelated Failures)

As of commit 3a93686 with merge base 4da1fa1 ():

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

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

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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This pull request was exported from Phabricator. Differential Revision: D77893838

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