Remove Logging.hpp from ArmNN.hpp

Logging.hpp is mainly useful for raising Arm NN log messages. There's
very little point in automatically including it for users of the library
via the ArmNN.hpp convenience header.

Signed-off-by: Matthew Bentham <Matthew.Bentham@arm.com>
Change-Id: I71fb3188dc0b30c1bbc86a31996470c707d38c19
diff --git a/src/armnn/Network.cpp b/src/armnn/Network.cpp
index 554e2e2..43c79c8 100644
--- a/src/armnn/Network.cpp
+++ b/src/armnn/Network.cpp
@@ -21,6 +21,7 @@
 #include <armnn/Utils.hpp>
 #include <armnn/TypesUtils.hpp>
 #include <armnn/BackendRegistry.hpp>
+#include <armnn/Logging.hpp>
 
 #include <ProfilingService.hpp>