Add aten::to NNAPI converter (#58540)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58540
Add support for aten::to op in the NNAPI model converter for simple
cases like to("cpu"), to("gpu")
Test Plan: pytest test/test_nnapi.py::TestNNAPI::test_to
Reviewed By: anshuljain1
Differential Revision: D28531941
fbshipit-source-id: 0c934f7aceaff2669307c3426efe32046d8c44f3
