Features
   * The configuration option MBEDTLS_USE_PSA_CRYPTO, which previously
     affected only a limited subset of crypto operations in TLS, X.509 and PK,
     now causes most of them to be done using PSA Crypto; see
     docs/use-psa-crypto.md for the list of exceptions.
   * The function mbedtls_pk_setup_opaque() now supports RSA key pairs as well.
     Opaque keys can now be used everywhere a private key is expected in the
     TLS and X.509 modules.
   * Opaque pre-shared keys for TLS, provisioned with
     mbedtls_ssl_conf_psk_opaque() or mbedtls_ssl_set_hs_psk_opaque(), which
     previously only worked for "pure" PSK key exchange, now can also be used
     for the "mixed" PSK key exchanges as well: ECDHE-PSK, DHE-PSK, RSA-PSK.

Add ChangeLog entries for general Use PSA improvements
Add ChangeLog entries for general Use PSA improvements

Signed-off-by: Manuel Pégourié-Gonnard <4ba0d615aeeda88e422ca8fba28fe2938485facf@arm.com>
