disp: msm: dp: Improvements to dp mst simulator mode

Improve dp mst simulator mode by adding support
for up to 8 connectors, the ability to add and
remove ports dynamically, and allowing for
different EDIDs for each connector.

CRs-Fixed: 2459530
Change-Id: I945e3292a7e5150ab7a6bbe0addc4f4f46d58e82
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>