Recent PCI changes are killing USB Power Management, and maybe more.

The root cause is a change to the PCI suspend code from back in May,
saving a copy of pci config space after the PCI driver did.  That
was OK until a recent change made it overwrite the copy that the
PCI device driver would later restore ... net result for USB is
that DMA would always be disabled after resume.

This patch restores the long-documented behavior of PCI driver
suspend/resume calls (drivers are responsible for saving and
restoring config space state), and also removes a superfluous line
from the USB suspend logic.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>