add Changelog

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/ChangeLog.d/some-max-size-macro-are-too-small-when-psa-ecc-is-accelerated.txt b/ChangeLog.d/some-max-size-macro-are-too-small-when-psa-ecc-is-accelerated.txt
new file mode 100644
index 0000000..9566a03
--- /dev/null
+++ b/ChangeLog.d/some-max-size-macro-are-too-small-when-psa-ecc-is-accelerated.txt
@@ -0,0 +1,5 @@
+Bugfix
+   * Fix proper sizing for PSA_EXPORT_[KEY_PAIR/PUBLIC_KEY]_MAX_SIZE and
+     PSA_SIGNATURE_MAX_SIZE buffers when at least one accelerated EC is bigger
+     than all built-in ones and RSA is disabled.
+     Resolves #6622.
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