hwc2: syncronize HWC & client(SF) state for DP

Since hotplug displays are bottom up, send HPD
in right order based on type of hotplug event.
In connect,  create display->refresh->send hotplug
In disconnect, send hotplug->refresh->destroy display

Change-Id: Ifd350ade05e23d9078f441c86c317420588251ca
2 files changed