Add changelog entry

Signed-off-by: Kusumit Ghoderao <Kusumit.Ghoderao@silabs.com>
diff --git a/ChangeLog.d/add-pbkdf2-cmac.txt b/ChangeLog.d/add-pbkdf2-cmac.txt
new file mode 100644
index 0000000..0ed84ea
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+++ b/ChangeLog.d/add-pbkdf2-cmac.txt
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+Features
+   * Add support for PBKDF2-CMAC through the PSA API.