IVGCVSW-7400 POW IVGCVSW-7278 SQUARED_DIFFERENCE to CpuAcc and GpuAcc

* Add POW SQUARED_DIFFERENCE and Unit tests for CpuAcc and GpuAcc

Signed-off-by: John Mcloughlin <john.mcloughlin@arm.com>
Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>

Change-Id: Ifa78af2a2fda2074586d8e4d9a506b1b13fa5755
diff --git a/src/backends/cl/backend.mk b/src/backends/cl/backend.mk
index 1f97ae7..03f1a95 100644
--- a/src/backends/cl/backend.mk
+++ b/src/backends/cl/backend.mk
@@ -1,5 +1,5 @@
 #
-# Copyright © 2017 ARM Ltd and Contributors. All rights reserved.
+# Copyright © 2017,2023 ARM Ltd and Contributors. All rights reserved.
 # SPDX-License-Identifier: MIT
 #
 
@@ -46,6 +46,7 @@
         workloads/ClDepthwiseConvolutionWorkload.cpp \
         workloads/ClDequantizeWorkload.cpp \
         workloads/ClDivisionWorkload.cpp \
+        workloads/ClElementwiseBinaryWorkload.cpp \
         workloads/ClExpWorkload.cpp \
         workloads/ClFillWorkload.cpp \
         workloads/ClFloorFloatWorkload.cpp \