RN: Cleanup ViewConfig Types

Summary:
Cleans up the Flow types for React Native ViewConfig. After this diff, we will have two new canonical types:

- `ViewConfig` which is what we get from native and what is registered in the `ReactNativeViewConfigRegistry`.
- `PartialViewConfig` which is what we generate statically and augment at runtime before registering with the `ReactNativeViewConfigRegistry`.

Changelog:
[Internal]

Reviewed By: JoshuaGross

Differential Revision: D25075299

fbshipit-source-id: 4b53927b2db437b615447b711e83db355d0cfa55

Libraries/Components/TextInput/AndroidTextInputViewConfig.js

@@ -11,7 +11,7 @@
 'use strict';
 
 import ReactNativeViewViewConfig from '../../Components/View/ReactNativeViewViewConfig';
-import type {ReactNativeBaseComponentViewConfig} from '../../Renderer/shims/ReactNativeTypes';
+import {type ViewConfig} from '../../Renderer/shims/ReactNativeTypes';
 
 const AndroidTextInputViewConfig = {
   uiViewClassName: 'AndroidTextInput',
@@ -111,4 +111,4 @@ const AndroidTextInputViewConfig = {
   },
 };
 
-module.exports = (AndroidTextInputViewConfig: ReactNativeBaseComponentViewConfig<>);
+module.exports = (AndroidTextInputViewConfig: ViewConfig);