[media] siano: print a message if DVB register succeeds

Right now, this is a debug message, misplaced. Promote it
to an info message, as it helps to discover if something
bad happened during device init.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/common/siano/smsdvb-main.c

···
 	client->event_unc_state = -1;
 	sms_board_dvb3_event(client, DVB3_EVENT_HOTPLUG);
 
-	pr_debug("success\n");
 	sms_board_setup(coredev);
 
 	if (smsdvb_debugfs_create(client) < 0)
···
 
 	dvb_create_media_graph(coredev->media_dev);
 
+	pr_info("DVB interface registered.\n");
 	return 0;
 
 client_error: