Updating submodules
Summary:
GitHub commits:
https://github.com/facebook/litho/commit/eff7e6d11d0c5fb0a665832b2ff8c5e735b2f1dc
https://github.com/pytorch/fbgemm/commit/7812ac2fa956b3c3edcb832f329fde433b79aff9
Test Plan: n/a
Reviewed By: zpao
fbshipit-source-id: a3f94dd5b48240169296d773b2828cd97b0871dd
