Define ticket creation time in TLS 1.2 case as well

The purpose of this change is to eventually base
the calculation in ssl_ticket.c of the ticket age
when parsing a ticket on the ticket creation time
both in TLS 1.2 and TLS 1.3 case.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 0be81af..542340b 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1228,6 +1228,12 @@
     uint32_t MBEDTLS_PRIVATE(ticket_lifetime);   /*!< ticket lifetime hint    */
 #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
 
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_SRV_C) && \
+    defined(MBEDTLS_HAVE_TIME)
+    /*! Time in milliseconds when the ticket was created. */
+    mbedtls_ms_time_t MBEDTLS_PRIVATE(ticket_creation_time);
+#endif
+
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS)
     uint8_t MBEDTLS_PRIVATE(ticket_flags);      /*!< Ticket flags */
     uint32_t MBEDTLS_PRIVATE(ticket_age_add);               /*!< Randomly generated value used to obscure the age of the ticket */
@@ -1238,15 +1244,10 @@
     char *MBEDTLS_PRIVATE(hostname);             /*!< host name binded with tickets */
 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION && MBEDTLS_SSL_CLI_C */
 
-#if defined(MBEDTLS_HAVE_TIME)
-#if defined(MBEDTLS_SSL_CLI_C)
-    mbedtls_ms_time_t MBEDTLS_PRIVATE(ticket_reception_time);   /*!< time when ticket was received. */
+#if defined(MBEDTLS_HAVE_TIME) && defined(MBEDTLS_SSL_CLI_C)
+    /*! Time in milliseconds when the last ticket was received. */
+    mbedtls_ms_time_t MBEDTLS_PRIVATE(ticket_reception_time);
 #endif
-#if defined(MBEDTLS_SSL_SRV_C)
-    mbedtls_ms_time_t MBEDTLS_PRIVATE(ticket_creation_time);    /*!< time when ticket was created. */
-#endif
-#endif /* MBEDTLS_HAVE_TIME */
-
 #endif /*  MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SESSION_TICKETS */
 
 #if defined(MBEDTLS_SSL_EARLY_DATA)