[fx2trt] update the oss fx2trt exmaple (#65544)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65544
ATT
Test Plan: CI
Reviewed By: mikekgfb
Differential Revision: D31147750
fbshipit-source-id: eacc1c9157a32d6deebbfe9ff2aaae13c434e72b
