Added changelog

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
diff --git a/ChangeLog.d/add_sign_verify_keygen_transparent_driver.txt b/ChangeLog.d/add_sign_verify_keygen_transparent_driver.txt
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+Features
+   * Partial implementation of the new PSA Crypto accelerator APIs for
+     enabling key generation and asymmetric signing/verification through crypto
+     accelerators. Contributed by Steven Cooreman in #3501.