Backport support for nouveau address-only transactions

[Shahar Or]

I was tipped
<https://lists.freedesktop.org/archives/nouveau/2017-September/028827.html>
that this
<https://github.com/torvalds/linux/commit/13a86519202c5d119d83640d6f781f3181205d2c>
would allow me to use my GTX 1080 Ti through DisplayPort.

Perhaps consider backporting it? I'm daily driving artful:

Linux shahar-desktop 4.12.0-13-generic #14-Ubuntu SMP Sat Sep 2 15:52:55
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
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