Reduce visibility of ReactAndroidHWInputDeviceHelper (#39731)

Summary:
Pull Request resolved: #39731

In an attempt to reduce footprint of React Native Android public APIs we are reducing visibility of classes and interfaces that are not meant to be used publicly OR are public but have no usages.
As part of our analysis, which involved looking for usages inside the Meta codebase and code search in OSS, we've detected that this class/interface is public but it's not used from other packages.

If you are using this class or interface please comment in this PR and we will restate the public access.

changelog: [Android][Changed] Reducing visibility of ReactAndroidHWInputDeviceHelper

Reviewed By: RSNara

Differential Revision: D49752132

fbshipit-source-id: 3eadc01f05f5ce49b4019fa8c3dafe8d5f5fc1f3

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactAndroidHWInputDeviceHelper.java

@@ -15,7 +15,7 @@
 import java.util.Map;
 
 /** Responsible for dispatching events specific for hardware inputs. */
-public class ReactAndroidHWInputDeviceHelper {
+class ReactAndroidHWInputDeviceHelper {
 
   /**
    * Contains a mapping between handled KeyEvents and the corresponding navigation event that should