Patch merged into coreboot/master: libpayload: usb: Add support for SuperSpeed hubs

the following patch was just integrated into master:
commit 752fba784681c2af0611a9d52ee1e8e2db8969a0
Author: Julius Werner 
Date:   Thu Jul 9 16:29:10 2015 -0700

libpayload: usb: Add support for SuperSpeed hubs

This patch adds support for the SuperSpeed half of USB 3.0 hubs, which
    previously prevented SuperSpeed devices behind those hubs from working.

BRANCH=None
    BUG=chrome-os-partner:39877
    TEST=Played around with multiple hubs and devices on Oak and Falco, can
    no longer find a combination that doesn't work.

Change-Id: I20815be95769e33d399b7ad91c3020687234e059
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 3db96ece20d2304e7f6f6aa333cf114037c48a3e
    Original-Change-Id: I2dd6c9c3607a24a7d78c308911e3d254d5f8d91d
    Original-Signed-off-by: Julius Werner 
    Original-Reviewed-on: https://chromium-review.googlesource.com/284577
    Original-Reviewed-by: Patrick Georgi 
    Original-Tested-by: chunfeng yun 
    Reviewed-on: http://review.coreboot.org/10958
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10958 for details.

-gerrit