C++ style enums 8/N: Direction (#1392)

Summary:
X-link: https://github.com/facebook/react-native/pull/39483

Pull Request resolved: https://github.com/facebook/yoga/pull/1392

Moves internal usages of YGDirection to Direction.

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Changelog: [Internal]

Reviewed By: rshest

Differential Revision: D49335231

fbshipit-source-id: 459fe820c91be88734cebaa8655cd3f0afda83bf

yoga/algorithm/CalculateLayout.h

@@ -16,6 +16,6 @@ void calculateLayout(
     yoga::Node* const node,
     const float ownerWidth,
     const float ownerHeight,
-    const YGDirection ownerDirection);
+    const Direction ownerDirection);
 
 } // namespace facebook::yoga