IVGCVSW-5783 'Add AsyncExecution Capability'

* Added AsyncExecution to the BackendCapability enum class.
* Logged a warning if backends do not support AsyncExecution capability if AsyncNetwork is created.

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: I49f8467297f4b6b8e414cb6a3638a7d3f1bb886a
diff --git a/src/backends/cl/ClBackend.cpp b/src/backends/cl/ClBackend.cpp
index 928760e..33aff27 100644
--- a/src/backends/cl/ClBackend.cpp
+++ b/src/backends/cl/ClBackend.cpp
@@ -141,6 +141,16 @@
     return layerSupport;
 }
 
+bool ClBackend::HasCapability(BackendCapability capabilityClass) const
+{
+    auto search = gpuAccCapabilities.find(capabilityClass);
+    if (search != gpuAccCapabilities.end())
+    {
+        return true;
+    }
+    return false;
+}
+
 OptimizationViews ClBackend::OptimizeSubgraphView(const SubgraphView& subgraph,
                                                   const ModelOptions& modelOptions) const
 {