Plumb display connection type to DMS

Secondary physical displays are now properly categorized as TYPE_INTERNAL
or TYPE_EXTERNAL, rather than assumed to be external. LocalDisplayAdapter
distinguishes between primary/secondary and internal/external categories
when populating DisplayInfo.

Bug: 134771872
Test: dumpsys display
Change-Id: Id43a72411131588897f29b8d8db417f8c9e78259