Summary:
This is a follow up PR to https://github.com/facebook/react-native/issues/24359. There's a good thread in the mentioned PR for more background for why I'm doing this change. Essentially `focusable` makes more sense since it is about whether a view can receive user-initiated focus from a pointer or keyboard.
Pull Request resolved: https://github.com/facebook/react-native/pull/25274
Differential Revision: D15873739
Pulled By: cpojer
fbshipit-source-id: 0f526bb99ecdc68131dfc10200a5d44c2ef75b33