This patch from Alan Stern started as as568.  It has been rediffed against
a current tree.

This patch adds minimal suspend/resume support to usb-storage.  Just enough
for it to qualify as PM-aware.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NMatthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>