[USB] powerpc: Workaround for the PPC440EPX USBH_23 errata [take 3]

[Alan Stern]

On Mon, 3 Nov 2008, Vitaly Bordug wrote:

> A published errata for ppc440epx states, that when running Linux with both
> EHCI and OHCI modules loaded, the EHCI module experiences a fatal error
> when a high-speed device is connected to the USB2.0, and functions normally
> if OHCI module is not loaded.
> 
> There used to be recommendation to use only hi-speed or full-speed
> devices with specific conditions, when respective module was unloaded.
> Later, it was observed that ohci suspend is enough to keep things
> going, and it was turned into workaround, as explained below.

Please fix this patch so that it does not cause a build error on
non-PowerPC architectures.

Alan Stern