integration-tests: Enable access to mbedtls "private" fields

Define the macro `MBEDTLS_ALLOW_PRIVATE_ACCESS` to avoid the build
failures caused while accessing private members of Mbed TLS structure
with Mbed TLS 3.6.0.

Signed-off-by: Devaraj Ranganna <[email protected]>

components/tools/freertos_libraries_integration_tests/CMakeLists.txt

@@ -15,6 +15,7 @@ set(PATCH_FILES
     "${PATCH_FILES_DIRECTORY}/0001-Reduce-the-TRANSPORT_TEST_BUFFER_WRITABLE_LENGTH.patch"
     "${PATCH_FILES_DIRECTORY}/0002-closefile-validsignature-test-Fix-test-bugs.patch"
     "${PATCH_FILES_DIRECTORY}/0003-Increase-keep-alive-interval.patch"
+    "${PATCH_FILES_DIRECTORY}/0004-Enable-access-to-mbedtls-private-fields.patch"
 )
 iot_reference_arm_corstone3xx_apply_patches("${freertos_libraries_integration_tests_SOURCE_DIR}" "${PATCH_FILES}")
 

components/tools/freertos_libraries_integration_tests/integration/patches/0004-Enable-access-to-mbedtls-private-fields.patch

@@ -0,0 +1,32 @@
+From c5a51e721331175a3ea3f42093c4336ad2697889 Mon Sep 17 00:00:00 2001
+From: Devaraj Ranganna <[email protected]>
+Date: Tue, 21 May 2024 12:56:39 +0000
+Subject: [PATCH] Enable access to mbedtls "private" fields
+
+Define the macro `MBEDTLS_ALLOW_PRIVATE_ACCESS` so that, the Mbed TLS structure
+fields that are marked as private are still accessible.
+
+Signed-off-by: Devaraj Ranganna <[email protected]>
+---
+ src/pkcs11/core_pkcs11_test.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/pkcs11/core_pkcs11_test.c b/src/pkcs11/core_pkcs11_test.c
+index 71bad5a..6dcc8b5 100644
+--- a/src/pkcs11/core_pkcs11_test.c
++++ b/src/pkcs11/core_pkcs11_test.c
+@@ -32,6 +32,11 @@
+ #include <stdlib.h>
+ #include <string.h>
+
++/**
++ *  @brief Declaring MBEDTLS_ALLOW_PRIVATE_ACCESS allows access to mbedtls "private" fields.
++ */
++#define MBEDTLS_ALLOW_PRIVATE_ACCESS
++
+ /* corePKCS11 includes. */
+ #include "core_pki_utils.h"
+ #include "core_pkcs11.h"
+--
+2.43.2
+