[FSDP] Allow non-uniform `requires_grad` for `use_orig_params=True` (#98221)
Closes https://github.com/pytorch/pytorch/issues/91167.
Differential Revision: [D44660134](https://our.internmc.facebook.com/intern/diff/D44660134)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98221
Approved by: https://github.com/rohan-varma
