{
 "$schema": "http://solettaproject.github.io/soletta/schemas/config.schema",
 "nodetypes": [
  {
   "name": "Button",
   "type": "gtk/pushbutton"
  },
  {
   "name": "LED",
   "options": {
      "rgb": "255|0|0"
   },
   "type": "gtk/led"
  },
  {
   "name": "Relay",
   "options": {
      "rgb": "255|0|0"
   },
   "type": "gtk/led"
  },
  {
   "name": "SoundSensor",
   "options": {
    "range": "0|400"
   },
   "type": "gtk/slider"
  }
 ]
}

{
 "$schema": "http://solettaproject.github.io/soletta/schemas/config.schema",
 "nodetypes": [
  {
   "name": "Button",
   "type": "gtk/pushbutton"
  },
  {
   "name": "LED",
   "options": {
      "rgb": "255|0|0"
   },
   "type": "gtk/led"
  },
  {
   "name": "Relay",
   "options": {
      "rgb": "255|0|0"
   },
   "type": "gtk/led"
  },
  {
   "name": "SoundSensor",
   "options": {
    "range": "0|400"
   },
   "type": "gtk/slider"
  },
  {
   "name": "LED_PWM",
   "options": {
    "duty_cycle": 0,
    "enabled": true,
    "period": 2040816,
    "pin": "6"
   },
   "type": "gtk/pwm-viewer"
  }
 ]
}

Make it possible to use LED_PWM in gtk mode
grove-samples: Make it possible to use LED_PWM in gtk mode

Running fine samples grove-led-accumulator.fbp and
grove-led-wave-generator.fbp

Signed-off-by: Otavio Pontes <a04f37e3ccb281cf4119e4b2fa8286ed94121d92@intel.com>
