Add support ElementwiseMax operator in graph API

Signed-off-by: thecha01 <theo.charalambous@arm.com>
Change-Id: I764f1eabb6412350eb719cc755b8777efc7d70a1
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3736
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/src/graph/backends/NEON/NEFunctionFactory.cpp b/src/graph/backends/NEON/NEFunctionFactory.cpp
index 4fee630..1a1519b 100644
--- a/src/graph/backends/NEON/NEFunctionFactory.cpp
+++ b/src/graph/backends/NEON/NEFunctionFactory.cpp
@@ -69,6 +69,7 @@
     using Addition       = NEArithmeticAddition;
     using Subtraction    = NEArithmeticSubtraction;
     using Multiplication = NEPixelWiseMultiplication;
+    using Maximum        = NEElementwiseMax;
 };
 
 /** Collection of NEON unary element-wise functions */