Add ChangeLog entry for #3319: fix typo in test

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/fix-typo-in-xts-test.txt b/ChangeLog.d/fix-typo-in-xts-test.txt
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+Changes
+   * Fix typo in XTS tests. Reported and fix submitted by Kxuan. #3319