IVGCVSW-2546 Add ILayerVisitor to the public API

Change-Id: I803de435a538856de2daa7872e27d3f5beabba4f
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 82f7d11..3c1932d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -155,6 +155,7 @@
     include/armnn/DescriptorsFwd.hpp
     include/armnn/Exceptions.hpp
     include/armnn/ILayerSupport.hpp
+    include/armnn/ILayerVisitor.hpp
     include/armnn/INetwork.hpp
     include/armnn/IProfiler.hpp
     include/armnn/IRuntime.hpp