add hotplug connector support

[Alex Deucher]

On Sun, Nov 9, 2014 at 11:22 PM, Dave Airlie <airlied at gmail.com> wrote:
> 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.

Series is:
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

Probably worthwhile to add MST support to xf86-video-modesetting as well.

Alex