Add mbedtls_ssl_session_set_alpn() function

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index a6ee9a4..b05bfe1 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1304,6 +1304,10 @@
     char *MBEDTLS_PRIVATE(hostname);             /*!< host name binded with tickets */
 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION && MBEDTLS_SSL_CLI_C */
 
+#if defined(MBEDTLS_SSL_EARLY_DATA) && defined(MBEDTLS_SSL_ALPN) && defined(MBEDTLS_SSL_SRV_C)
+    char *ticket_alpn;                      /*!< ALPN negotiated in the session */
+#endif
+
 #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);
@@ -1312,9 +1316,6 @@
 
 #if defined(MBEDTLS_SSL_EARLY_DATA)
     uint32_t MBEDTLS_PRIVATE(max_early_data_size);          /*!< maximum amount of early data in tickets */
-#if defined(MBEDTLS_SSL_ALPN) && defined(MBEDTLS_SSL_SRV_C)
-    char *alpn;                      /*!< ALPN negotiated in the session */
-#endif
 #endif
 
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)