BugLink: http://bugs.launchpad.net/bugs/1540390

Provide an updated i915 driver in the ubuntu directory. In subsequent
patches we'll rename this driver to be i915_bpo and strictly limit it's
support to only Skylake, Kabylake and Broxton. Keeping the initial sync
a separate stand alone patch will allow us to easily update this driver
again later.

The driver is based on drm-intel-next-2016-02-14 tag.
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>