Adds touch calibration methods to system.idl API

Adds the three methods to system.idl file.
  - touchCalibrationStart
  - touchCalibrationSet
  - touchCalibrationReset

Also adds the required object type/structs to system.idl file.
  - Point
  - TouchCalibrationPair
  - TouchCalibrationPairQuad

Design Doc=go/cros-touch-calibration

BUG=667921
COMPONENT=System_display.idl, system display interface, display info provider

Review-Url: https://codereview.chromium.org/2538623002
Cr-Commit-Position: refs/heads/master@{#435514}
9 files changed