Move default spacing out of csslayout

Summary: The concept of default padding was confusing and only used by react-native android. Makes more sense to let them manage this themselve.

Reviewed By: foghina

Differential Revision: D3709574

fbshipit-source-id: 6e0277bd97407a5c642d742f93ca2ac70d7307da

java/com/facebook/csslayout/CSSNodeAPI.java

@@ -79,7 +79,6 @@ public interface CSSNodeAPI<CSSNodeType extends CSSNodeAPI> {
   float getLayoutWidth();
   float getLayoutHeight();
   CSSDirection getLayoutDirection();
-  void setDefaultPadding(int spacingType, float padding);
   CSSOverflow getOverflow();
   void setOverflow(CSSOverflow overflow);
   void setData(Object data);