COMPMID-1522: Add ElementWiseOperation node in the graph API

Change-Id: Icb428bf3b5d3634fdddc57562cce670776e7f7a3
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/145814
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/arm_compute/graph/frontend/Types.h b/arm_compute/graph/frontend/Types.h
index f9505e2..79ce52e 100644
--- a/arm_compute/graph/frontend/Types.h
+++ b/arm_compute/graph/frontend/Types.h
@@ -40,6 +40,7 @@
 using graph::PermutationVector;
 
 using graph::ActivationLayerInfo;
+using graph::EltwiseOperation;
 using graph::FullyConnectedLayerInfo;
 using graph::NormalizationLayerInfo;
 using graph::NormType;
@@ -56,13 +57,6 @@
 using graph::InterpolationPolicy;
 using graph::Size2D;
 
-/** Branch layer merging method */
-enum class BranchMergeMethod
-{
-    DEPTH_CONCATENATE, /**< Concatenate across depth */
-    ADD                /**< Adds the results of each stream */
-};
-
 /** Hints that can be passed to the stream to expose parameterization */
 struct StreamHints
 {