Added changelog entry for AES-ECB in PSA

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
diff --git a/ChangeLog.d/add-aes-ecb-to-psa.txt b/ChangeLog.d/add-aes-ecb-to-psa.txt
new file mode 100644
index 0000000..2fa57ad
--- /dev/null
+++ b/ChangeLog.d/add-aes-ecb-to-psa.txt
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+Features
+   * Added support for AES-ECB to the PSA Crypto cipher API.