IVGCVSW-4516 Add ConvertFp32ToBf16Layer and Ref workload support

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I9099a4f840fb747336f77d20a0868b64e801a310
diff --git a/Android.mk b/Android.mk
index 436ae22..2370b33 100644
--- a/Android.mk
+++ b/Android.mk
@@ -134,6 +134,7 @@
         src/armnn/layers/Convolution2dLayer.cpp \
         src/armnn/layers/ConvertBf16ToFp32Layer.cpp \
         src/armnn/layers/ConvertFp16ToFp32Layer.cpp \
+        src/armnn/layers/ConvertFp32ToBf16Layer.cpp \
         src/armnn/layers/ConvertFp32ToFp16Layer.cpp \
         src/armnn/layers/DebugLayer.cpp \
         src/armnn/layers/DepthToSpaceLayer.cpp \