NNXSW-3081 Move Filesystem.hpp and Threads.hpp to public include

!android-nn-driver:5966

Change-Id: Ice0b4d2872bb0e09bfc0763034a206c3a8f24af4
Signed-off-by: Rob Hughes <robert.hughes@arm.com>
diff --git a/tests/ImageTensorGenerator/ImageTensorGenerator.cpp b/tests/ImageTensorGenerator/ImageTensorGenerator.cpp
index 5417eb4..a2110f9 100644
--- a/tests/ImageTensorGenerator/ImageTensorGenerator.cpp
+++ b/tests/ImageTensorGenerator/ImageTensorGenerator.cpp
@@ -7,7 +7,7 @@
 #include "../InferenceTestImage.hpp"
 #include <armnn/Logging.hpp>
 #include <armnn/TypesUtils.hpp>
-#include <Filesystem.hpp>
+#include <armnnUtils/Filesystem.hpp>
 
 #include <mapbox/variant.hpp>
 #include <cxxopts/cxxopts.hpp>