COMPMID-1277 - Optimizing CLIm2ColKernel for NHWC.

This patch includes:

- Im2Col optimizations for NHWC using a new data layout
- Refactoring of CLIm2ColKernel adding validation method and auto-init
- Removed im2col_reduced from CLIm2ColKernel and created a new kernel CLFlattenLayerKernel

Change-Id: I1620640b6796baa268324b33ae92cdd8de53e27c
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/141241
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
diff --git a/tests/datasets/ShapeDatasets.h b/tests/datasets/ShapeDatasets.h
index 937bd08..4a6d778 100644
--- a/tests/datasets/ShapeDatasets.h
+++ b/tests/datasets/ShapeDatasets.h
@@ -160,14 +160,14 @@
         : ShapeDataset("Shape",
     {
         // Batch size 1
-        TensorShape{ 9U, 9U },
+        TensorShape{ 11U, 11U },
                      TensorShape{ 27U, 13U, 2U },
                      TensorShape{ 128U, 64U, 1U, 3U },
                      // Batch size 4
-                     TensorShape{ 9U, 9U, 3U, 4U },
+                     TensorShape{ 11U, 11U, 3U, 4U },
                      TensorShape{ 27U, 13U, 2U, 4U },
                      // Arbitrary batch size
-                     TensorShape{ 9U, 9U, 3U, 5U }
+                     TensorShape{ 11U, 11U, 3U, 5U }
     })
     {
     }