Merge changes Iedccae91,I19e0fc8d,I8780bfc5,I532af6ee,I002d039f into dev/msm-4.14-display

* changes:
  drm/msm/dp: handle DisplayPort ON/OFF during PM suspend/resume
  drm/msm/dp: limit the maximum lane count for multi-functional dongles
  drm/msm/dp: cancel attention work on disconnect
  drm/msm/dp: enable aux retry logic
  drm/msm/dp: check for sink count before enabling post_open callback