rename `ticket_creation` to `ticket_creation_time`

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/src/test_helpers/ssl_helpers.c b/tests/src/test_helpers/ssl_helpers.c
index f7cd103..9acb199 100644
--- a/tests/src/test_helpers/ssl_helpers.c
+++ b/tests/src/test_helpers/ssl_helpers.c
@@ -1754,7 +1754,7 @@
 
 #if defined(MBEDTLS_HAVE_TIME)
     if (session->endpoint == MBEDTLS_SSL_IS_SERVER) {
-        session->ticket_creation = mbedtls_ms_time() - 42;
+        session->ticket_creation_time = mbedtls_ms_time() - 42;
     }
 #endif
 
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 4f9ec1a..ebbbddb 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -1975,7 +1975,7 @@
 #if defined(MBEDTLS_HAVE_TIME)
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
     if (tls_version == MBEDTLS_SSL_VERSION_TLS1_3) {
-        TEST_ASSERT(original.ticket_creation == restored.ticket_creation);
+        TEST_ASSERT(original.ticket_creation_time == restored.ticket_creation_time);
     }
 #endif
 
@@ -2066,7 +2066,7 @@
 
 #if defined(MBEDTLS_HAVE_TIME) && defined(MBEDTLS_SSL_SRV_C)
         if (endpoint_type == MBEDTLS_SSL_IS_SERVER) {
-            TEST_ASSERT(original.ticket_creation == restored.ticket_creation);
+            TEST_ASSERT(original.ticket_creation_time == restored.ticket_creation_time);
         }
 #endif
 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)