[DDP] Remove self.modules_params (#64473)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64473
Unused after SPMD deprecated.
ghstack-source-id: 137526305
Test Plan: CI
Reviewed By: zhaojuanmao
Differential Revision: D30745961
fbshipit-source-id: 32d102502570291e01579e5b47a6d74dc71013bb
