drm/sde: report connector id based on display type

User space client creates displays based on the order of connector
IDs reported by kernel. So driver needs to report the correct
connector IDs based on display_type defined in DTS file.

CRs-Fixed: 1084253
Change-Id: I771a300bc5322ee4f87f417534267636d84891c6
Signed-off-by: Jin Li <jinl@codeaurora.org>