[android][readme] Aar native linking add fbjni (#40578)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/40578
Test Plan: Imported from OSS
Differential Revision: D22239286
Pulled By: IvanKobzarev
fbshipit-source-id: 7a4160b621af8cfcc3b3d9e6da1a75c8afefba27
