Hide constants for TLS 1.0 and TLS 1.1

ssl_server2 had a check that we never try to use a minor version lower
than 2 with DTLS, but that check is no longer needed, as there's no way
that would happen now that MBEDTLS_SSL_MINOR_VERSION_1 is no longer
public.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

library/ssl_ciphersuites.c

@@ -31,6 +31,7 @@
 
 #include "mbedtls/ssl_ciphersuites.h"
 #include "mbedtls/ssl.h"
+#include "ssl_misc.h"
 
 #include <string.h>