Revert some changes about tls13 and macros

There is one PR #4988 to change it in the future

Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index b88351f..ed6a445 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1051,15 +1051,13 @@
 #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED &&
           !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
 
-#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
 typedef struct
 {
     unsigned char client_application_traffic_secret_N[ MBEDTLS_MD_MAX_SIZE ];
     unsigned char server_application_traffic_secret_N[ MBEDTLS_MD_MAX_SIZE ];
     unsigned char exporter_master_secret             [ MBEDTLS_MD_MAX_SIZE ];
     unsigned char resumption_master_secret           [ MBEDTLS_MD_MAX_SIZE ];
-} mbedtls_ssl_tls13_application_secrets;
-#endif
+} mbedtls_ssl_tls1_3_application_secrets;
 
 #if defined(MBEDTLS_SSL_DTLS_SRTP)
 
@@ -1125,9 +1123,7 @@
      * to be studied whether one of them can be removed. */
     unsigned char MBEDTLS_PRIVATE(minor_ver);    /*!< The TLS version used in the session. */
 
-#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
-    mbedtls_ssl_tls13_application_secrets MBEDTLS_PRIVATE(app_secrets);
-#endif
+    mbedtls_ssl_tls1_3_application_secrets MBEDTLS_PRIVATE(app_secrets);
 
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)