Add pci_enable_device()/pci_disable_device().  In the past, drivers often
worked without this, but it is now required in order to route PCI
interrupts correctly.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>