Arm backend: Preserve inputs for pow zero decomposition

[Sebastian-Larsson]

Keep pow(x, 0) dependent on the original input when decomposing it to ones, so the TOSA graph still expects the user input.

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

[pytorch-bot]

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