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: I8a87964555e17609687934d8fa7d4ad8bf2e530a
CRs-fixed: 2129671
1 file changed