IVGCVSW-2771 Fix SubTensor error in vgg16 ExecuteNetwork NEON

 * Add check if Sub-tensors cannot be used, call ACL function
 * Add computation of SplitAxis from SplitterDescriptor
 * Add NeonSplitterWorkload functions
 * Modify IsSplitterSupported to call ACL validate function
if sub-tensor cannot be used
 * Also check if quantization parameters match when using sub-tensors
 * Add more unit tests for Splitter in TfParser and TfLiteParser

Signed-off-by: Narumol Prangnawarat <narumol.prangnawarat@arm.com>
Change-Id: I31e4c7d055117c83c65b598c4125442173242226
diff --git a/src/backends/neon/workloads/NeonSplitterWorkload.hpp b/src/backends/neon/workloads/NeonSplitterWorkload.hpp
index 2a7ee19..f902566 100644
--- a/src/backends/neon/workloads/NeonSplitterWorkload.hpp
+++ b/src/backends/neon/workloads/NeonSplitterWorkload.hpp
@@ -7,18 +7,26 @@
 
 #include <backendsCommon/Workload.hpp>
 
+#include <arm_compute/runtime/NEON/NEFunctions.h>
+
+#include <functional>
+
 namespace armnn
 {
 
+arm_compute::Status NeonSplitterWorkloadValidate(const TensorInfo& input,
+                                                 const std::vector<std::reference_wrapper<TensorInfo>>& outputs,
+                                                 unsigned int splitAxis);
+
 class NeonSplitterWorkload : public BaseWorkload<SplitterQueueDescriptor>
 {
 public:
-    using BaseWorkload<SplitterQueueDescriptor>::BaseWorkload;
+    NeonSplitterWorkload(const SplitterQueueDescriptor& descriptor, const WorkloadInfo& info);
 
-    virtual void Execute() const override
-    {
-        // With subtensors, splitter is a no-op.
-    }
+    void Execute() const override;
+
+private:
+    mutable std::unique_ptr<arm_compute::NESplit> m_Layer;
 };
 
 } //namespace armnn