Automated submodule update: FBGEMM (pytorch#62)

Summary:
This is an automated pull request to update the first-party submodule for [pytorch/FBGEMM](https://github.com/pytorch/FBGEMM).

New submodule commit: pytorch/FBGEMM@a358709

Pull Request resolved: pytorch/torchrec#62

Test Plan: Ensure that CI jobs succeed on GitHub before landing.

Reviewed By: jasonjk-park

Differential Revision: D34135477

fbshipit-source-id: 2e38653219597a4aea683f0da0468c9b50a08fda