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/ClWorkloadFactory.cpp b/src/backends/cl/ClWorkloadFactory.cpp
index 0228677..493080f 100644
--- a/src/backends/cl/ClWorkloadFactory.cpp
+++ b/src/backends/cl/ClWorkloadFactory.cpp
@@ -459,6 +459,13 @@
                                                                       info,
                                                                       m_CLCompileContext);
                 }
+                case BinaryOperation::Power:
+                case BinaryOperation::SqDiff:
+                {
+                    return std::make_unique<ClElementwiseBinaryWorkload>(*elementwiseBinaryQueueDescriptor,
+                                                                         info,
+                                                                         m_CLCompileContext);
+                }
                 case BinaryOperation::Sub:
                 {
                     SubtractionQueueDescriptor subtractionQueueDescriptor;