IVGCVSW-5476 Fix Fuse_batchNorm_into_Conv2D_Float32_Test

* failing with no backends provided

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: I55ebfc52268ad667e495831c64977338d003db99
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a6d88e0..c2e394d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -645,6 +645,7 @@
         src/armnn/test/optimizations/ConvertConstantsHalfToFloatTests.cpp
         src/armnn/test/optimizations/Fp32NetworkToBf16ConverterTests.cpp
         src/armnn/test/optimizations/Fp32NetworkToFp16ConverterTests.cpp
+        src/armnn/test/optimizations/FuseBatchNormTests.cpp
         src/armnn/test/optimizations/InsertDebugLayerTests.cpp
         src/armnn/test/optimizations/MovePermuteUpTests.cpp
         src/armnn/test/optimizations/MoveTransposeUpTests.cpp