UBUNTU: [Config] Add DRM ast driver to udeb installer image

[Tim Gardner]

https://lists.ubuntu.com/archives/kernel-team/2016-January/068992.html

This thread implies that the associated patch has been applied to all
affected releases. However, while checking the release states I noticed
that it had not been applied to Wily master-next. I've taken the liberty
of doing so.

rtg
-- 
Tim Gardner tim.gardner at canonical.com