Fix fx graph triton import bug (#122041)
Summary: Unless we register triton to be a special import, FX graph import mechanism imports it as `from fx-generated._0 import triton as triton` which is obviously broken.
Test Plan:
I could not figure out how to write a test for this but
```
buck2 run 'fbcode//mode/dev-nosan' fbcode//tgif/lib/tests/gpu_tests:lowering_pass_test -- -r test_default_ait_lowering_multi_hardwares
```
now passes
Differential Revision: D54990782
Pull Request resolved: https://github.com/pytorch/pytorch/pull/122041
Approved by: https://github.com/aakhundov
