Update aot_arm_compiler to use export_for_training (#5581)

Summary:
Remove capture_pre_autograd_graph and use updated export_for_training within the aot_arm_compiler.py script

Pull Request resolved: https://github.com/pytorch/executorch/pull/5581

Reviewed By: kirklandsign

Differential Revision: D63367930

Pulled By: digantdesai

fbshipit-source-id: 3b161432d533d8debcf7fdfdb244b69fa48adc8d