[react-native] Update type definition for requireNativeComponent for 0.57.x

requireNativeComponent now only takes a string and returns a string. See the definition here: https://github.com/facebook/react-native/blob/1151c096dab17e5d9a6ac05b61aacecd4305f3db/Libraries/ReactNative/requireNativeComponent.js#L24-L27.

The return type here is specified as `React.ReactType`, which is a union type that includes strings. We can't use `string` because TypeScript treats it as an intrinsic element like `div` and thinks it has no props.

Updated the corresponding test code too.

types/react-native/index.d.ts

@@ -9030,34 +9030,15 @@ export const Platform: PlatformStatic;
 export const PlatformIOS: PlatformIOSStatic;
 export const PixelRatio: PixelRatioStatic;
 
-export interface ComponentInterface<P> {
-    name?: string;
-    displayName?: string;
-    propTypes: PropTypes.ValidationMap<P>;
-}
-
 /**
- * Used to create React components that directly wrap native component
- * implementations.  Config information is extracted from data exported from the
- * UIManager module.  You should also wrap the native component in a
- * hand-written component with full propTypes definitions and other
- * documentation - pass the hand-written component in as `componentInterface` to
- * verify all the native props are documented via `propTypes`.
+ * Creates values that can be used like React components which represent native
+ * view managers. You should create JavaScript modules that wrap these values so
+ * that the results are memoized. Example:
  *
- * If some native props shouldn't be exposed in the wrapper interface, you can
- * pass null for `componentInterface` and call `verifyPropTypes` directly
- * with `nativePropsToIgnore`;
+ *   const View = requireNativeComponent('RCTView');
  *
- * Common types are lined up with the appropriate prop differs with
- * `TypeToDifferMap`.  Non-scalar types not in the map default to `deepDiffer`.
  */
-export function requireNativeComponent<P, NP = {}>(
-    viewName: string,
-    componentInterface?: ComponentInterface<P>,
-    extraConfig?: { nativeOnly?: NP }
-): React.ComponentClass<
-    Partial<PropTypes.InferProps<PropTypes.ValidationMap<P>>> & { [K in keyof NP]?: any}
->;
+export function requireNativeComponent(viewName: string): React.ReactType;
 
 export function findNodeHandle(
     componentOrHandle: null | number | React.Component<any, any> | React.ComponentClass<any>

types/react-native/test/index.tsx

@@ -822,12 +822,7 @@ class BridgedComponentTest extends React.Component {
     }
 }
 
-const NativeBridgedComponent = requireNativeComponent("NativeBridgedComponent", BridgedComponentTest, {
-    nativeOnly: {
-        nativeProp: true,
-    }
-});
-
+const NativeBridgedComponent = requireNativeComponent("NativeBridgedComponent");
 
 const SwitchColorTest = () => (
     <Switch trackColor={{ true: 'pink', false: 'red'}} />