Arm backend: Fix TOSA compile spec deprecation test

[Sebastian-Larsson]

Update the deprecation test to call _from_list() instead of the nonexistent from_list() helper on TosaCompileSpec.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @robell

[pytorch-bot]

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• viable/strict has been blocked for 5+ days

❌ 2 Cancelled Jobs, 3 Unrelated Failures

As of commit 2f8037a with merge base ddd62c5 ():

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

• trunk / test-models-macos-coreml (mobilebert) / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos-coreml (vit) / macos-job (gh)
  ##[error]The operation was canceled.

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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