ChangeLog.d/psa_crypto_reduced_configs.txt

Changes
   * Automatically enable MBEDTLS_PK_WRITE_C if MBEDTLS_PK_C and
     MBEDTLS_USE_PSA_CRYPTO are enabled. This is due to ecdsa_verify_wrap
     requirements, but will also probably be needed by RSA soon, hence the
     broader PK_C requirement.