Rename FabricMountItem.* to MountItem.* (facebook#36722)

Summary:
Pull Request resolved: facebook#36722

Changelog: [Android][Fixed] Renamed FabricMountItem.* files to MountItem.* to better match the name of the struct.

Reviewed By: javache

Differential Revision: D44540079

fbshipit-source-id: f40ac14fbca6ec1875ef014cd741ced5915e8a89

Author: Vincent Viego

packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricMountingManager.cpp

@@ -8,7 +8,7 @@
 #include "FabricMountingManager.h"
 
 #include "EventEmitterWrapper.h"
-#include "FabricMountItem.h"
+#include "MountItem.h"
 #include "StateWrapperImpl.h"
 
 #include <react/jni/ReadableNativeMap.h>

packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricMountItem.cpp renamed to packages/react-native/ReactAndroid/src/main/jni/react/fabric/MountItem.cpp

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#include "FabricMountItem.h"
+#include "MountItem.h"
 
 namespace facebook {
 namespace react {