Patch merged into coreboot/master: 8cdd963 libpayload: reintroduce optional PCI in XHCI driver

the following patch was just integrated into master:
commit 8cdd963aa3be926a3a73097fd6c1ce292e0254b5
Author: Patrick Georgi 
Date:   Sat Dec 21 11:41:22 2013 +0100

libpayload: reintroduce optional PCI in XHCI driver

being a good citizen on the box, libpayload tries to return to EHCI
    mode on shutdown, so a non-XHCI capable USB driver after it (eg. in
    the OS) finds something to work with.

Change-Id: Id227d646e08a258b841c644263112f0815dd486c
    Signed-off-by: Patrick Georgi

See http://review.coreboot.org/4547 for details.

-gerrit