IVGCVSW-3235 Add scalar to use as padding value in Reference Pad

Signed-off-by: David Monahan <david.monahan@arm.com>
Change-Id: If050f318fcb7626bbfae1b8737a1d232a4a5a915
diff --git a/src/armnnSerializer/Serializer.cpp b/src/armnnSerializer/Serializer.cpp
index 126247b..208262b 100644
--- a/src/armnnSerializer/Serializer.cpp
+++ b/src/armnnSerializer/Serializer.cpp
@@ -577,7 +577,8 @@
     }
 
     auto flatBufferPadDesc = serializer::CreatePadDescriptor(m_flatBufferBuilder,
-                                                             m_flatBufferBuilder.CreateVector(padList));
+                                                             m_flatBufferBuilder.CreateVector(padList),
+                                                             padDescriptor.m_padValue);
 
     auto flatBufferPadLayer = serializer::CreatePadLayer(m_flatBufferBuilder,
                                                          flatBufferBaseLayer,