IVGCVSW-5416 'Add android-nn-driver support for CAST

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: I02da912e5e4ca650b367ca40fe3f5ca5baa61cbb
diff --git a/src/backends/reference/workloads/RefCastWorkload.hpp b/src/backends/reference/workloads/RefCastWorkload.hpp
index 6742ef0..870fb41 100644
--- a/src/backends/reference/workloads/RefCastWorkload.hpp
+++ b/src/backends/reference/workloads/RefCastWorkload.hpp
@@ -18,6 +18,9 @@
 public:
     using BaseWorkload<CastQueueDescriptor>::BaseWorkload;
     void Execute() const override;
+    void ExecuteAsync(WorkingMemDescriptor& workingMemDescriptor)  override;
+private:
+    void Execute(std::vector<ITensorHandle*> inputs, std::vector<ITensorHandle*> outputs) const;
 };
 
 } //namespace armnn