Add support for hotplug events on primary display

Remove the ifdefs protecting hotplug from being called.
Fix Hwcomposer to use the display index instead of the display type when
sending a hotplug event.

Bug: 18698244

Change-Id: I32582c23323e409ca602db86d297c406e4010da9
14 files changed
tree: 0942feb361fbe694d68b5493b81c5e205921384c
  1. merrifield/
  2. moorefield_hdmi/