COMPMID-803: Add NHWC data format support for CL batch normalisation

Change-Id: Ie37588f60b9cfc7b1d09b1e8628fcfb4b17e0717
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/123834
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/core/Utils.cpp b/src/core/Utils.cpp
index 4a237f9..b5663e6 100644
--- a/src/core/Utils.cpp
+++ b/src/core/Utils.cpp
@@ -126,6 +126,18 @@
     return channels_map[channel];
 }
 
+const std::string &arm_compute::string_from_data_layout(DataLayout dl)
+{
+    static std::map<DataLayout, const std::string> dl_map =
+    {
+        { DataLayout::UNKNOWN, "UNKNOWN" },
+        { DataLayout::NCHW, "NCHW" },
+        { DataLayout::NHWC, "NHWC" },
+    };
+
+    return dl_map[dl];
+}
+
 const std::string &arm_compute::string_from_data_type(DataType dt)
 {
     static std::map<DataType, const std::string> dt_map =