IVGCVSW-4065 Refactor the IPacketBuffer smart pointers

 * Added convenience "using" statement for the unique pointers to
   IPacketBuffer
 * Replaced all the occurrencies in the code

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: Iffec3a425ffbc1ecb23012971563a48139eb32eb
diff --git a/src/profiling/IPacketBuffer.hpp b/src/profiling/IPacketBuffer.hpp
index b4bd615..c61d232 100644
--- a/src/profiling/IPacketBuffer.hpp
+++ b/src/profiling/IPacketBuffer.hpp
@@ -5,6 +5,8 @@
 
 #pragma once
 
+#include <memory>
+
 namespace armnn
 {
 
@@ -35,6 +37,8 @@
     virtual unsigned char* GetWritableData() = 0;
 };
 
+using IPacketBufferPtr = std::unique_ptr<IPacketBuffer>;
+
 } // namespace profiling
 
-} // namespace armnn
\ No newline at end of file
+} // namespace armnn