drm/i915: restore only the mode of this driver on lastclose (v2)

drm/i915: restore only the mode of this driver on lastclose (v2)

BugLink: https://bugs.launchpad.net/bugs/848687

i915 calls the panic handler function on last close to reset the modes,
however this is a really bad idea for multi-gpu machines, esp shareable
gpus machines. So add a new entry point for the driver to just restore
its own fbcon mode.

v2: move code into fb helper, fix panic code to block mode change on
powered off GPUs.

[airlied: this hits drm core and I wrote it and it was reviewed on intel-gfx
 so really I signed it off twice ;-).]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit e8e7a2b8ccfdae0d4cb6bd25824bbedcd42da316)

Signed-off-by: Evan Broder <ebroder@mokafive.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>