Call prepare_traced_pt2 instead of prepare_pt2 in get_fake_quant_model

[ethansfng]

Summary: avoids tracing twice

Differential Revision: D88103722

[pytorch-bot]

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 0897636 with merge base 0a94ecf ():

NEW FAILURE - The following job has failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255

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

• pull / test-llama-runner-linux-android / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux-basic (vit, portable, cmake, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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[meta-codesync]

@ethansfng has exported this pull request. If you are a Meta employee, you can view the originating Diff in D88103722.

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