message: Add play_pause to hmi_capabilities test file
diff: "longPressAvailable": true,
  "upDownAvailable": true
  },
  + {
  + "name": "PLAY_PAUSE",
  + "shortPressAvailable": true,
  + "longPressAvailable": true,
  + "upDownAvailable": true
  + },
  {
  "name": "SEEKLEFT",
  "shortPressAvailable": true,
  