cpp_dummy_build: Add missing header psa_util.h

Add missing header to fix #2579.

Change-Id: I038166b826534bac853be34a0281384e26675187
diff --git a/ChangeLog b/ChangeLog
index 9ab0c03..a91c046 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -23,6 +23,8 @@
      GCM and CCM were not affected. Fixed by Jack Lloyd.
    * Fix incorrect default port number in ssl_mail_client example's usage.
      Found and fixed by irwir. #2337
+   * Add psa_util.h to test/cpp_dummy_build to fix build_default_make_gcc_and_cxx.
+     Fixed by Peter Kolbus (Garmin). #2579
 
 Changes
    * Server's RSA certificate in certs.c was SHA-1 signed. In the default