Features
    * Extend the existing PSA_ALG_TLS12_PSK_TO_MS() algorithm to support
      mixed-psk. Add an optional input PSA_KEY_DERIVATION_INPUT_OTHER_SECRET
      holding the other secret.

Add change log entry for mixed-psk
Add change log entry for mixed-psk

Signed-off-by: Przemek Stekiel <1d381786fa074b2f2333843496828c8e4357e75f@mobica.com>
