[iOS][OSS][BE] Remove unused files (#64849)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64849
ghstack-source-id: 137827893
Test Plan: CircleCI
Reviewed By: hanton
Differential Revision: D30877962
fbshipit-source-id: a76f7fe888b990ba6cad650f72be7f4a1e58a2f1
