Delete feature flag enable_call_immediates_android
Delete feature flag enable_call_immediates_android

Summary:
changelog: [internal]

This is shipped, let's remove gating

Reviewed By: philIip

Differential Revision: D38745414

fbshipit-source-id: 21381a89b01040f2209aeb458cef2637d21e981d

javache/react-native,facebook/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,facebook/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,javache/react-native,janicduplessis/react-native,janicduplessis/react-native