This adds some of the infrastructure needed to support some more
USB capabilities:

 -  CONFIG_USB_SUSPEND, so Linux can put individual devices
    into the USB "suspend" state.  They can (sometimes) use
    "remote wakeup" to resume the host; or they can each be
    resumed by the host.

      + New usbcore device selective suspend/resume APIs
	* Define them, as stubs for now
	* Call them on the paths sysfs uses (renamed functions)
      + HCD support
	* Define root hub suspend calls; delegate them to HCDs.
	* OHCI and EHCI can suspend/resume root hubs that way.
	* Not called yet, until suspend/resume calls exist

 -  CONFIG_USB_OTG, which depends on the selective suspend APIs
    to allow devices to switch roles (host to peripheral, etc).
    This patch just adds a few key flags in usb_bus, needed by
    usbcore (during enumeration) and by HCD and OTG controllers
    on OTG-capable boards.

 -  Related bugfix:  power budgeting is supposed to place a
    100mA per port (non-OTG) for bus-powered devices.

This patch changes no behavior; later patches will do that,
and they'll be smaller because of this.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>