Merge branch 'refs/heads/forward-upstream/next-20191018/touch-config/v0-wip' into f/next-20191018/devkit-drm-integration/v1-wip-Aev0fe7AhD2j

* refs/heads/forward-upstream/next-20191018/touch-config/v0-wip:
  librem5-devkit: Enable touchscreen
  input: touchscreen: Selelct TOUCHSCREEN_PROPERTIES for drivers using it
  librem5-devkit_defconfig: Enable imx8 mixel dphy