Merge branch 'working-hikey-tracking-drm-v4.4' into working-hikey-mainline-rebase-v4.4-c30

* working-hikey-tracking-drm-v4.4: (21 commits)
  drm/hisilicon: Fix module compile undefined error
  drm/hisilicon: add select HISI_KIRIN_DW_DSI
  drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format
  fix: drm driver build error for 4.4
  drm/hisilicon: Add dsi encoder panel support
  drm/hisilicon: Add dsi panel connector
  drm/hisilicon: Add dsi mux gpio control
  drm/hisilicon: Add panel endpoint parse
  drm/hisilicon: Add dsi host transfer callback
  drm/hisilicon: Add select DRM_PANEL
  MAINTAINERS: Add maintainer for hisilicon DRM driver
  drm/hisilicon: Add support for external bridge
  drm/hisilicon: Add designware dsi host driver
  drm/hisilicon: Add designware dsi encoder driver
  drm/hisilicon: Add cma fbdev and hotplug
  drm/hisilicon: Add vblank driver for ADE
  drm/hisilicon: Add plane driver for ADE
  drm/hisilicon: Add crtc driver for ADE
  drm/hisilicon: Add hisilicon kirin drm master driver
  drm/hisilicon: Add device tree binding for hi6220 display subsystem
  ...