Add addition timing logging output

 * Adds ExecuteNetwork when building the delegate only
 * Adds timings to delegate subgraph creation
 * Adds executions times

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Ieff2f67ea8dbb6c2a708f8810e84a20485b7a631
diff --git a/src/armnn/Network.cpp b/src/armnn/Network.cpp
index e5f098e..54d9ae2 100644
--- a/src/armnn/Network.cpp
+++ b/src/armnn/Network.cpp
@@ -1614,7 +1614,7 @@
                               const OptimizerOptions& options,
                               Optional<std::vector<std::string>&> messages)
 {
-    ARMNN_LOG(info) << options.ToString();
+    ARMNN_LOG(debug) << options.ToString();
 
     // Enable profiling
     auto profiler = inNetwork.pNetworkImpl->GetGraph().GetProfiler();