IVGCVSW-2019 : replace Compute enum in the backend preferences list

Change-Id: Ie7549fd27378acfa97e68d098e338b8c9d4ea5d2
diff --git a/src/armnnCaffeParser/test/TestInputs.cpp b/src/armnnCaffeParser/test/TestInputs.cpp
index 616d75d..bd13a09 100644
--- a/src/armnnCaffeParser/test/TestInputs.cpp
+++ b/src/armnnCaffeParser/test/TestInputs.cpp
@@ -42,7 +42,7 @@
     armnn::NetworkId netId;
 
     // Check everything works normally
-    std::vector<armnn::Compute> backends = {armnn::Compute::CpuRef};
+    std::vector<armnn::BackendId> backends = {armnn::Compute::CpuRef};
     {
         network = parser->CreateNetworkFromString(explicitInput.c_str(), {}, { "data" });
         BOOST_TEST(network.get());