move config jni methods to vanilla jni

Summary: Move yoga node config related jni methods to vanilla jni

Reviewed By: amir-shalem

Differential Revision: D17684821

fbshipit-source-id: 31a667b3ad67501aaef83a132971e4e0826cacd4

java/com/facebook/yoga/YogaConfig.java

@@ -38,7 +38,5 @@ public abstract class YogaConfig {
 
   abstract long getNativePointer();
 
-  public abstract void setUseVanillaJNI(boolean useVanillaJNI);
-
   public abstract boolean useVanillaJNI();
 }