[native] Move React Native patchfile

Summary: Forgot to do this after D5542. This diff silences a warning that was appearing in the postinstall build log for the native workspace, which doesn't normally show in yarn unless you run yarn add inside the workspace or something.

Test Plan: yarn cleaninstall && cd native && yarn postinstall, verify there is no warning

Reviewers: atul, tomek

Reviewed By: atul

Subscribers: abosh

Differential Revision: https://phab.comm.dev/D5591