drm_hwcomposer: Introduce Planner interface
am: 4c4646e7b8

* commit '4c4646e7b8a5cffdc8a2d53374b5340c07d14012':
  drm_hwcomposer: Introduce Planner interface

Change-Id: Ia44346289bd7a3b6501ee4430425c1f989de5b95