IVGCVSW-4730 Remove the duplication of PIPE_MAGIC in the code base

Change-Id: I41c6e917b29eee33360758b6c5afe5dadba89093
Signed-off-by: Finn Williams <Finn.Williams@arm.com>
diff --git a/profiling/common/include/Constants.hpp b/profiling/common/include/Constants.hpp
new file mode 100644
index 0000000..52e0e48
--- /dev/null
+++ b/profiling/common/include/Constants.hpp
@@ -0,0 +1,10 @@
+//
+// Copyright © 2020 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+namespace armnnProfiling
+{
+    static const unsigned int PIPE_MAGIC = 0x45495434;
+}
\ No newline at end of file