Improve the prerequisites for early data
*
* Enable support for RFC 8446 TLS 1.3 early data.
*
-* Requires: MBEDTLS_SSL_PROTO_TLS1_3
+* Requires: MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ENABLED or
+* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL_ENABLED
*
* Comment this to disable support for early data.
*
