Revert "[FSDP]Add device_mesh to FSDPstate (#102317)"
This reverts commit 4c584acc5d87ece9b236424cef6474c453e8d4b3.
Reverted https://github.com/pytorch/pytorch/pull/102317 on behalf of https://github.com/malfet due to Broke test_fake_pg, see https://github.com/pytorch/pytorch/actions/runs/5100633726/jobs/9173277369 ([comment](https://github.com/pytorch/pytorch/pull/102317#issuecomment-1566129496))
