message: led: Update LED init API
  mraa_led_init API expects led number. So, replace it with
  mraa_led_init_raw for initializing an LED based on label.
diff: @@ -76,7 +76,7 @@ led_context led_init_str(const char* name){
  dev->gpio = NULL;
  dev->name = name;
  - dev->gpioled = mraa_led_init(name);
  + dev->gpioled = mraa_led_init_raw(name);
  if (!dev->gpioled) {
  printf("%s: Unable to initialize gpioled device (%s).\n", __FUNCTION__, dev->name);
  