IVGCVSW-6844 replace armnn:IgnoreUnused with arm::pipe::IgnoreUnused in profiling code

Change-Id: Ifbdfb034deda2f792ac1069dac808917606ccc9e
Signed-off-by: Jim Flynn <jim.flynn@arm.com>
diff --git a/src/armnn/test/RuntimeTests.cpp b/src/armnn/test/RuntimeTests.cpp
index afe4bc7..9cf322c 100644
--- a/src/armnn/test/RuntimeTests.cpp
+++ b/src/armnn/test/RuntimeTests.cpp
@@ -429,8 +429,8 @@
 
     // These are needed because VALGRIND_COUNT_LEAKS is a macro that assigns to the parameters
     // so they are assigned to, but still considered unused, causing a warning.
-    IgnoreUnused(dubious);
-    IgnoreUnused(suppressed);
+    armnn::IgnoreUnused(dubious);
+    armnn::IgnoreUnused(suppressed);
 }
 #endif // WITH_VALGRIND