drm/i915: Enable Haswell support
* The drm/i915 driver includes its own set of PCI ids, making those in
drm_pciids.h redundant. Remove i915/i930 ids from this file.
* Unfortunately our old drm code base expects to directly use device
lists with a different format.
* Rewrite the i915_probe() routine to use the driver-included device
list and patch a special-purpose, one-element list in the legacy
format at runtime to make the old drm_attach() routine and associated
code happy.
* At this point, Haswell GPUs still exhibit display corruption issues
with 2D acceleration. Disabling it in xorg.conf is recommended.