COMPMID-1637 - Add ROIAlign operator to the graph API

Change-Id: I8a9b1e16d90b9d99a6ff2a442347748432723b14
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index 929a402..8d9bad3 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -54,6 +54,7 @@
 class ReorgLayerNode;
 class ReshapeLayerNode;
 class ResizeLayerNode;
+class ROIAlignLayerNode;
 class SoftmaxLayerNode;
 class SliceLayerNode;
 class SplitLayerNode;