Add fsdp to e2e hf_bert (#1177)
Summary:
Basically the same as https://github.com/pytorch/benchmark/pull/1142
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1177
Reviewed By: xuzhao9, davidberard98
Differential Revision: D39509753
Pulled By: erichan1
fbshipit-source-id: 9d29e434993dd08ec4e755581895a2bab12e5c23
