Summary:
This change updates the way in which we consume the list of components from the `react-native.config.js` files so that it is aligned to what Android does.
## Changelog:
[iOS][Changed] - Update how the `react-native.config.js` is consumed to add elements in the interop layer.
Reviewed By: cortinico
Differential Revision: D43875395
fbshipit-source-id: e359c98a9144f4efe62967096d48318491718958