Fix buck cell for xplat builds.

[hsharma35]

Summary: Explicitly use fbsource cell when building for xplat.

Differential Revision: D83441105

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14651

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❌ 1 New Failure, 3 Unrelated Failures

As of commit d3183c1 with merge base df8d03b ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 66d3fae91de19724d294b266a09fe25a30d70fa0cbcaa11e70be6d9bb7de7949 /exec failed with exit code 1

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

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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@hsharma35 has exported this pull request. If you are a Meta employee, you can view the originating diff in D83441105.

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@hsharma35 has exported this pull request. If you are a Meta employee, you can view the originating diff in D83441105.