CxxReactPackage: Use hungarian notation for hybridData (#41675)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/41675

FBJni expects the HybridData object to exist on the mHybridData property of the java object. So, we have to call this propery mHybridData.

Otherwise, this fbjni class just won't work.

Changelog: [Internal]

Reviewed By: javache

Differential Revision: D51550621

fbshipit-source-id: d169266474717f0a38799ede7c07af57461012b7

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/cxxreactpackage/CxxReactPackage.kt

@@ -17,13 +17,13 @@ import com.facebook.soloader.SoLoader
 @UnstableReactNativeAPI()
 abstract class CxxReactPackage {
 
-  @DoNotStrip @SuppressWarnings("unused") private val hybridData: HybridData
+  @DoNotStrip @Suppress("NoHungarianNotation") private var mHybridData: HybridData? = initHybrid()
 
   protected abstract fun initHybrid(): HybridData
 
   protected constructor() {
     maybeLoadOtherSoLibraries()
-    hybridData = initHybrid()
+    mHybridData = initHybrid()
   }
 
   @Synchronized protected open fun maybeLoadOtherSoLibraries(): Unit {}