IVGCVSW-6847 replace armnn:Optional with arm::pipe::Optional in profiling code

Change-Id: I048c538d4f8c21770aec2b2751c934d9fa15a4dc
Signed-off-by: Jim Flynn <jim.flynn@arm.com>
diff --git a/src/profiling/IProfilingService.cpp b/src/profiling/IProfilingService.cpp
index cd85bb9..3bae941 100644
--- a/src/profiling/IProfilingService.cpp
+++ b/src/profiling/IProfilingService.cpp
@@ -15,7 +15,7 @@
 std::unique_ptr<IProfilingService> IProfilingService::CreateProfilingService(
     uint16_t maxGlobalCounterId,
     IInitialiseProfilingService& initialiser,
-    armnn::Optional<IReportStructure&> reportStructure)
+    arm::pipe::Optional<IReportStructure&> reportStructure)
 {
     return std::make_unique<ProfilingService>(maxGlobalCounterId, initialiser, reportStructure);
 }