clear DraweeControllerBuilder after usage

Reviewed By: achen1

Differential Revision: D4908279

fbshipit-source-id: 8de9930a2160f3201f8b7a8a66415310fa2f41de

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

@@ -449,6 +449,10 @@ public class ReactImageView extends GenericDraweeView {
 
     setController(mDraweeControllerBuilder.build());
     mIsDirty = false;
+
+    // Reset again so the DraweeControllerBuilder clears all it's references. Otherwise, this causes
+    // a memory leak.
+    mDraweeControllerBuilder.reset();
   }
 
   // VisibleForTesting