Fix MissingSoLoaderLibrary: Add @SoLoaderLibrary to DefaultSoLoader

Summary:
Fixed MissingSoLoaderLibrary lint error in DefaultSoLoader.kt.

Added SoLoaderLibrary("react_newarchdefaults") annotation to the class which calls SoLoader.loadLibrary("react_newarchdefaults") but was missing the annotation needed for build tools to sanity check JNI merging.

changelog: [internal] internal

Differential Revision: D95413024

Author: mdvacca

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/defaults/DefaultSoLoader.kt

@@ -8,7 +8,9 @@
 package com.facebook.react.defaults
 
 import com.facebook.soloader.SoLoader
+import com.facebook.soloader.annotation.SoLoaderLibrary
 
+@SoLoaderLibrary("react_newarchdefaults")
 internal object DefaultSoLoader {
   @Synchronized
   @JvmStatic