Changelog entry for error code space unification

Signed-off-by: Gilles Peskine <[email protected]>
Mbed-TLS · Jan 24, 2025 · 6d1c757 · 6d1c757
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+API changes
+   * The PSA and Mbed TLS error space are now unified. This means that
+     psa_xxx() functions can now potentially return MBEDTLS_ERR_xxx
+     values and mbedtls_xxx() functions can return PSA_ERROR_xxx values.
+     This will not affect most applications since in both cases, the
+     error values are between -32767 and -1 as before.