add hotplug connector support

Dave Airlie airlied at
Sun Nov 9 20:22:42 PST 2014

These patches just prepare the DDX for naming DP 1.2 MST connectors
properly and to expect hotplug connectors.

They are ported from similiar code I wrote for the Intel DDX.

kernel support for radeon MST is still WIP, but I should get
these upstream I suppose.


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