haswell displayport MST audio support

Dave Airlie
2015-06-17T04:02:05Z

Hi guys,

Since the audio folks have ignored me mostly, I'm sending these patches
as-is, I'd like to get the GPU side merged, and hopefully provoke
some action from the Intel audio people, otherwise I guess I get to
ship these in Fedora/RHEL and everyone else can do what they like.

Dave.