Remove legacy SurfaceRegistry reference (#56972)

Summary:
Pull Request resolved: #56972

No longer referenced by native

Changelog: [Internal]

Reviewed By: christophpurrer

Differential Revision: D106357609

fbshipit-source-id: bc49538f7634230e667cad98f9beef0bd97c4f19

Author: javache

packages/react-native/Libraries/ReactNative/AppRegistry.js

@@ -29,12 +29,6 @@ AppRegistry.registerComponent('LogBox', () => {
 
 global.RN$AppRegistry = AppRegistry;
 
-// Backwards compat with SurfaceRegistry, remove me later
-global.RN$SurfaceRegistry = {
-  renderSurface: AppRegistry.runApplication,
-  setSurfaceProps: AppRegistry.setSurfaceProps,
-};
-
 registerCallableModule('AppRegistry', AppRegistry);
 
 export {AppRegistry};