Add OpInfo for `nn.functional.poisson_nll_loss` (#67371)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/67371
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D31973173
Pulled By: ejguan
fbshipit-source-id: 3cbb21d292b95039f7c7d1f4caa300f3d619740a
