IVGCVSW-4209 Create a public API for the ArmNN Utils

 * Moved the relevant armnnUtils headers to the new location:
   include/armnnUtils
 * Update the header usage throughout the source code

!android-nn-driver:2387

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: I2ba15cebcacafad2b5a1a7b9c3312ffc585e09d6
diff --git a/tests/ImagePreprocessor.cpp b/tests/ImagePreprocessor.cpp
index 74bc943..f0184e4 100644
--- a/tests/ImagePreprocessor.cpp
+++ b/tests/ImagePreprocessor.cpp
@@ -2,11 +2,14 @@
 // Copyright © 2017 Arm Ltd. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
+
 #include "InferenceTestImage.hpp"
 #include "ImagePreprocessor.hpp"
-#include "Permute.hpp"
+
 #include <armnn/TypesUtils.hpp>
 
+#include <armnnUtils/Permute.hpp>
+
 #include <boost/numeric/conversion/cast.hpp>
 #include <boost/assert.hpp>
 #include <boost/format.hpp>