DRM based mode setting

Here's an updated patch set for core DRM + i915 mode setting.  I spent a
good part of the day trying to reduce the size of the patches against
the core, so things should be nearly reviewable now.  I'm still tracking
down the unload/load bug (was hoping the diff reduction + audit would
magically fix it, but alas).  This patchset sits on top of
2db46b5668dfed59acacd75dfc49ecf947ea5aeb from the anholt's
drm-intel-next branch.  It should work well enough to set an initial
mode and let you play around with it if you do 'modprobe i915 modeset=1'
to load it.

Comments & review appreciated.

Thanks,
Jesse

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