early data: rename configuration function

Rename mbedtls_ssl_tls13_conf_early_data as
mbedtls_ssl_conf_early_data since in the future this may not be
specific to TLS 1.3.

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 1bab915..e80996c 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -2776,7 +2776,7 @@
     }
 
 #if defined(MBEDTLS_SSL_EARLY_DATA)
-    mbedtls_ssl_tls13_conf_early_data(&conf, tls13_early_data_enabled);
+    mbedtls_ssl_conf_early_data(&conf, tls13_early_data_enabled);
     if (tls13_early_data_enabled == MBEDTLS_SSL_EARLY_DATA_ENABLED) {
         mbedtls_ssl_tls13_conf_max_early_data_size(
             &conf, opt.max_early_data_size);