[RELEASE ONLY CHANGES] Use release torchao for OpenVINO

[rascani]

This change removes the torchao pip install from the openvino_build.sh script for release 1.1. See #15880 as example from 1.0 release.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16883

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❌ 1 New Failure, 4 Pending, 3 Unrelated Failures

As of commit 2b9e5f0 with merge base 7492d0d ():

NEW FAILURE - The following job has failed:

• pull / test-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t a4017badf99c9d7bc0dd1e5def28f8f67cc7515ed480448252413fb9c7620129 /exec failed with exit code 1

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

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-mediatek-models-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (add_mul, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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