Add back deprecated getParent methods for non-breaking API change (#775)

Summary:
I'm not totally sure what I'm doing so if this needs changes let me know.
Closes https://github.com/facebook/yoga/pull/775

Reviewed By: emilsjolander

Differential Revision: D8331892

Pulled By: passy

fbshipit-source-id: eb1023e666322d2472e4081fd4a4e72a7b43d049

java/com/facebook/yoga/YogaNode.java

@@ -234,15 +234,14 @@ public class YogaNode implements Cloneable {
    * {@link YogaNode} is shared between two or more YogaTrees.
    */
   @Nullable
-  public
-  YogaNode getOwner() {
+  public YogaNode getOwner() {
     return mOwner;
   }
 
   /** @deprecated Use #getOwner() instead. This will be removed in the next version. */
   @Deprecated
   @Nullable
-  YogaNode getParent() {
+  public YogaNode getParent() {
     return getOwner();
   }