Do not add a new field in the SSL config

We cannot add a new field in SSL config in
an LTS. Use `session_tickets` field instead.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/src/test_helpers/ssl_helpers.c b/tests/src/test_helpers/ssl_helpers.c
index 7d5d889..b0fe2bd 100644
--- a/tests/src/test_helpers/ssl_helpers.c
+++ b/tests/src/test_helpers/ssl_helpers.c
@@ -2544,7 +2544,7 @@
     TEST_EQUAL(ret, 0);
 
     mbedtls_ssl_conf_enable_new_session_tickets(
-        &client_ep.conf, MBEDTLS_SSL_ENABLE_NEW_SESSION_TICKETS_ENABLED);
+        &client_ep.conf, MBEDTLS_SSL_NEW_SESSION_TICKETS_ENABLED);
 
     mbedtls_ssl_conf_session_tickets_cb(&server_ep.conf,
                                         mbedtls_test_ticket_write,