Add MBEDTLS_ALLOW_PRIVATE_ACCESS to test programs

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/programs/ssl/ssl_test_lib.c b/programs/ssl/ssl_test_lib.c
index 1bb9d61..04e127a 100644
--- a/programs/ssl/ssl_test_lib.c
+++ b/programs/ssl/ssl_test_lib.c
@@ -20,6 +20,8 @@
  *  limitations under the License.
  */
 
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+
 #include "ssl_test_lib.h"
 
 #if defined(MBEDTLS_TEST_HOOKS)