tls: Initialize SSL context tls_version in mbedtls_ssl_setup()

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index ad019b1..6a7fa96 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1393,6 +1393,7 @@
     if ((ret = ssl_conf_check(ssl)) != 0) {
         return ret;
     }
+    ssl->tls_version = ssl->conf->max_tls_version;
 
     /*
      * Prepare base structures