COMPMID-1595  Add UpsampleLayer to graph API

Change-Id: I7427b0fbb222ff9760d47b01a59aee654f2f860f
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/149587
Tested-by: bsgcomp <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index 18a8e2e..ae5ed7c 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -54,6 +54,7 @@
 class SoftmaxLayerNode;
 class SliceLayerNode;
 class SplitLayerNode;
+class UpsampleLayerNode;
 class YOLOLayerNode;
 } // namespace graph
 } // namespace arm_compute