IVGCVSW-4516 Add ConvertFp32ToBf16Layer and Ref workload support

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I9099a4f840fb747336f77d20a0868b64e801a310
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d0f518..034f346 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -276,6 +276,8 @@
     src/armnn/layers/ConvertBf16ToFp32Layer.hpp
     src/armnn/layers/ConvertFp16ToFp32Layer.hpp
     src/armnn/layers/ConvertFp16ToFp32Layer.cpp
+    src/armnn/layers/ConvertFp32ToBf16Layer.hpp
+    src/armnn/layers/ConvertFp32ToBf16Layer.cpp
     src/armnn/layers/ConvertFp32ToFp16Layer.hpp
     src/armnn/layers/ConvertFp32ToFp16Layer.cpp
     src/armnn/layers/DebugLayer.hpp