Move timer into the endpoint structure

No behavior change.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/include/test/ssl_helpers.h b/tests/include/test/ssl_helpers.h
index f712660..a7bc065 100644
--- a/tests/include/test/ssl_helpers.h
+++ b/tests/include/test/ssl_helpers.h
@@ -194,6 +194,9 @@
     mbedtls_ssl_context ssl;
     mbedtls_ssl_config conf;
     mbedtls_test_mock_socket socket;
+#if defined(MBEDTLS_TIMING_C)
+    mbedtls_timing_delay_context timer;
+#endif
 
     /* Objects owned by the endpoint */
     mbedtls_x509_crt *ca_chain;