Portenta: WiFi: remove debug on Serial1

[facchinm]

Logs can be printed by calling

whd_print_logbuffer();

To change default port from Serial1 to another transport (Serial for example), simply declare

REDIRECT_STDOUT_TO(Serial);

at the top of the sketch.

[jwestmoreland]

Thanks again for this Martino! Came in handy when going back to a previous rev to make sure WiFi was OK,
John