COMPMID-2362: Add Quantization Layer to the graph API

Change-Id: I9766ad54e8da1367ba192dfeeccdc879f3729550
Signed-off-by: Isabella Gottardi <isabella.gottardi@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1172
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index 06c2e1f..0f3450b 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -54,6 +54,7 @@
 class PermuteLayerNode;
 class PoolingLayerNode;
 class PriorBoxLayerNode;
+class QuantizationLayerNode;
 class ReorgLayerNode;
 class ReshapeLayerNode;
 class ResizeLayerNode;