Rename TestUtils to UnitTestRegistration. (#4021)
Looking to remove usage of 'Utils' unless we have really no choice.
'UnitTestRegistration' seems clearer in what it does compared to
'TestUtils'.
diff --git a/src/app/tests/TestMessageDef.cpp b/src/app/tests/TestMessageDef.cpp
index 51ae2b1..14bf7b2 100644
--- a/src/app/tests/TestMessageDef.cpp
+++ b/src/app/tests/TestMessageDef.cpp
@@ -24,7 +24,7 @@
#include <app/MessageDef.h>
#include <core/CHIPTLVDebug.hpp>
-#include <support/TestUtils.h>
+#include <support/UnitTestRegistration.h>
#include <system/SystemPacketBuffer.h>
#include <nlunit-test.h>