Fix Android CI

Summary:
This diff removes android x dependencies from: react/processing/BUCK

"react/processing" is a java library and it shouldn't have an Android dependency, the purpose of this diff is to fix the CI in RN OSS repository

Reviewed By: makovkastar

Differential Revision: D16247319

fbshipit-source-id: c488ad234c292e85f8fc117634a9f2e51f582e39