Introduce MBEDTLS_PRIVATE macro.

Public structs members are considered private and should not
be used by users application.

MBEDTLS_PRIVATE(member) macro is intended to clearly indicate
which members are private.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 2ef07fa..ca03532 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -2,6 +2,8 @@
 /*----------------------------------------------------------------------------*/
 /* Headers */
 
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+
 #include <test/macros.h>
 #include <test/helpers.h>
 #include <test/random.h>
diff --git a/tests/suites/main_test.function b/tests/suites/main_test.function
index ac00f45..62a6678 100644
--- a/tests/suites/main_test.function
+++ b/tests/suites/main_test.function
@@ -29,14 +29,6 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-#include "psa/crypto.h"
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#if defined(MBEDTLS_TEST_HOOKS)
-#include "mbedtls/error.h"
-#endif
-
 /* Test code may use deprecated identifiers only if the preprocessor symbol
  * MBEDTLS_TEST_DEPRECATED is defined. When building tests, set
  * MBEDTLS_TEST_DEPRECATED explicitly if MBEDTLS_DEPRECATED_WARNING is