Updating submodules
Summary:
GitHub commits:
https://github.com/facebook/litho/commit/efdfedc74906b4f7d3cbb3ccc3ab8a3b4e3d46c9
https://github.com/pytorch/fbgemm/commit/15a29e620bf412309d0e734f27711245dd0a5940
Test Plan: n/a
Reviewed By: zpao
fbshipit-source-id: df306a4b693299f76d904bf15f24bb2cf367ab30
