sna: Create a stable output name based on MST topology

In order to provide persistent names for MST devices, which may change
topology dynamically, the kernel exports a PATH blob. We can then use
this path to generate the output name, and so reuse existing XID when a
monitor is plugged back in.

Based on the patch for -modesetting by Dave Airlie.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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