Remove need for platform overrides in SafeAreaView.js (#38601)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/38601

This file is forked in out of tree platforms as:

- macOS > https://github.com/microsoft/react-native-macos/blob/main/Libraries/Components/SafeAreaView/SafeAreaView.js#L28-L33
- Windows > https://github.com/microsoft/react-native-windows/blob/0.71-stable/vnext/src/Libraries/Components/SafeAreaView/SafeAreaView.windows.js#L30-L36

The change here removes the need of forking this file

Changelog:
[General] [Fixed] - [SafeAreaView] Remove need for platform overrides in SafeAreaView.js

Reviewed By: NickGerleman

Differential Revision: D47734944

fbshipit-source-id: 84249a3b3e7e3807b3d5ee4bfa4b1cb140541b8b