Moving PCI to a per-instance device model

This should include the correct sysfs setup as well. Please review.
Signed-off-by: NDave Jiang <djiang@mvista.com>
Signed-off-by: NDouglas Thompson <dougthompson@xmission.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>