IVGCVSW-1883 Add support for different memory layouts

Change-Id: I6e9973bf25acad980fb4e96af8080ac829db0d28
diff --git a/include/armnn/Types.hpp b/include/armnn/Types.hpp
index 6d89e0e..172df1b 100644
--- a/include/armnn/Types.hpp
+++ b/include/armnn/Types.hpp
@@ -28,6 +28,12 @@
     Signed32  = 3
 };
 
+enum class DataLayout
+{
+    NCHW = 1,
+    NHWC = 2
+};
+
 enum class ActivationFunction
 {
     Sigmoid     = 0,