IVGCVSW-6469 Add MirrorPad FrontEnd and Ref Support

 * Added PaddingMode enum to PaddingDescriptor to enable Symmetric and
   Reflect padding.
 * Added Symmetric and Reflect Ref implementation.
 * Added Serializer & Deserializer support.
 * Added unit tests.

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I4bed907b31742b32ccefe5e8ca39a6f1e5bd9dee
diff --git a/src/backends/cl/workloads/ClPadWorkload.cpp b/src/backends/cl/workloads/ClPadWorkload.cpp
index 10c8907..4697510 100644
--- a/src/backends/cl/workloads/ClPadWorkload.cpp
+++ b/src/backends/cl/workloads/ClPadWorkload.cpp
@@ -39,7 +39,7 @@
 
     arm_compute::PaddingList padList = static_cast<arm_compute::PaddingList>(reversed_PadList);
 
-    arm_compute::PixelValue pixelValue = GetPixelValue(input, descriptor.m_Parameters.m_PadValue);
+    arm_compute::PixelValue pixelValue = GetPixelValue(input.info(), descriptor.m_Parameters.m_PadValue);
 
     m_Layer.configure(clCompileContext, &input, &output, padList, pixelValue);
 }