unix/mbedtls: Enable mbedtls cert time validation.

To match other ports.

Signed-off-by: Carlos Gil <carlosgilglez@gmail.com>

ports/unix/mbedtls/mbedtls_config.h

@@ -29,6 +29,10 @@
 // Set mbedtls configuration
 #define MBEDTLS_CIPHER_MODE_CTR // needed for MICROPY_PY_CRYPTOLIB_CTR
 
+// Cert time validation
+#define MBEDTLS_HAVE_TIME
+#define MBEDTLS_HAVE_TIME_DATE
+
 // Enable mbedtls modules
 #define MBEDTLS_HAVEGE_C
 #define MBEDTLS_TIMING_C