IVGCVSW-7227 Forward declare ILocalPacketHandlerSharedPtr in IRuntime.hpp

* IRuntime.hpp includes one file from the profiling interface and it's
  causing some build problems for some users. Replace the include with
  a forward declaration of arm::pipe::ILocalPacketHandlerSharedPtr.

Signed-off-by: Colm Donelan <colm.donelan@arm.com>
Change-Id: I6064e02db4ca056423bb448ddc0d712b50a704cb

include/armnn/IRuntime.hpp

diff --git a/include/armnn/IRuntime.hpp b/include/armnn/IRuntime.hpp
index 9ea9ac8..0da6d80 100644
--- a/include/armnn/IRuntime.hpp
+++ b/include/armnn/IRuntime.hpp
@@ -16,11 +16,19 @@
 #include <armnn/backends/ICustomAllocator.hpp>
 #include <armnn/backends/IMemoryOptimizerStrategy.hpp>
 
-#include <client/include/ILocalPacketHandler.hpp>
-
 #include <memory>
 #include <map>
 
+namespace arm
+{
+
+namespace pipe
+{
+class ILocalPacketHandler;
+using ILocalPacketHandlerSharedPtr = std::shared_ptr<ILocalPacketHandler>;
+} // pipe
+} // arm
+
 namespace armnn
 {