Arm backend: Move import in DecomposePermuteForU55Pass

[AdrianLundell]

Importing on top-level causes a dependency cycle

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

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[Copilot]

Pull request overview

This PR adjusts the Arm backend’s DecomposePermuteForU55Pass to avoid a circular dependency by moving the EthosUCompileSpec import from module scope into the specific helper method that uses it.

Changes:

• Removed the top-level import of EthosUCompileSpec.
• Added a lazy (function-local) import of EthosUCompileSpec inside _violates_exact_constraint() to break the dependency cycle.

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