Create bugfix_iar_typo.txt

Changelog entry

Signed-off-by: Robin Kastberg <robin.kastberg@iar.com>
diff --git a/ChangeLog.d/bugfix_iar_typo.txt b/ChangeLog.d/bugfix_iar_typo.txt
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+Bugfix
+   * Fixed an issue that cause compile error using CMake IAR toolchain.