Change newly imported file to MIT license

Summary:
The project at large switched to MIT last month. A PR that was opened prior to the change was merged, this PR updates the file to use the correct license.

None, trivial PR

[ANDROID] [MINOR] [Image] Update license
Closes #18343

Differential Revision: D7252836

Pulled By: hramos

fbshipit-source-id: b7c207c782f4bf19c12d121e86f394e52326a5ab

Author: hramos

ReactAndroid/src/main/java/com/facebook/react/views/image/MultiPostprocessor.java

@@ -1,10 +1,8 @@
 /**
  * Copyright (c) 2017-present, Facebook, Inc.
- * All rights reserved.
  *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
  */
 
 package com.facebook.react.views.image;