Fix crash for setEventEmitterCallback NoSuchMethodError on API lvl 26

Summary:
Fixes facebook#48009

The app is currently crashing on Android API lvl 26 attempting to invoke the method
`setEventEmitterCallback` which is defined inside BaseJavaModule.

I'm not entirely sure why this is happening only for API lvl 26, but I've verified
that by having the method protected, this doesn't happen anymore.

The visibility is consistent with the field `mEventEmitterCallback` which is also
protected and accessed to codegen. So let's keep them aligned for consistency.

Changelog:
[Android] [Fixed] - Fix crash for setEventEmitterCallback NoSuchMethodError on API lvl 26

Differential Revision: D68018506

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -608,6 +608,7 @@ public abstract class com/facebook/react/bridge/BaseJavaModule : com/facebook/re
 	protected final fun getReactApplicationContextIfActiveOrWarn ()Lcom/facebook/react/bridge/ReactApplicationContext;
 	public fun initialize ()V
 	public fun invalidate ()V
+	protected fun setEventEmitterCallback (Lcom/facebook/react/bridge/CxxCallbackImpl;)V
 }
 
 public abstract interface class com/facebook/react/bridge/BridgeReactContext$RCTDeviceEventEmitter : com/facebook/react/bridge/JavaScriptModule {

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

@@ -134,7 +134,7 @@ protected final ReactApplicationContext getReactApplicationContext() {
   }
 
   @DoNotStrip
-  private final void setEventEmitterCallback(CxxCallbackImpl eventEmitterCallback) {
+  protected void setEventEmitterCallback(CxxCallbackImpl eventEmitterCallback) {
     mEventEmitterCallback = eventEmitterCallback;
   }
 }