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/src/backends/cl/test/ClOptimizedNetworkTests.cpp b/src/backends/cl/test/ClOptimizedNetworkTests.cpp
index d91e9b4..4c2a474 100644
--- a/src/backends/cl/test/ClOptimizedNetworkTests.cpp
+++ b/src/backends/cl/test/ClOptimizedNetworkTests.cpp
@@ -12,7 +12,7 @@
 #include <cl/ClWorkloadFactory.hpp>
 #include <cl/ClBackendContext.hpp>
 
-#include <Filesystem.hpp>
+#include <armnnUtils/Filesystem.hpp>
 
 #include <doctest/doctest.h>