Patch merged into coreboot/master: 677206d libpayload: Bring USB hub driver to a working state

the following patch was just integrated into master:
commit 677206d4a32112759afe93c36b9d4ed9931b0f2b
Author: Nico Huber 
Date:   Mon May 21 16:20:59 2012 +0200

libpayload: Bring USB hub driver to a working state

This adds proper device attachment and detachment detection and port enable-
    ment to the USB hub driver. Support for split transactions is still missing,
    so this works only with USB2.0 devices on hubs in USB2.0 mode and USB1.1
    devices on hubs in USB1.1 mode.

Change-Id: I80bf03f3117116a60382b87a4f84366370649915
    Signed-off-by: Nico Huber

Build-Tested: build bot (Jenkins) at Thu May 31 18:52:01 2012, giving +1
Reviewed-By: Stefan Reinauer  at Thu Jun  7 23:12:44 2012, giving +2
See http://review.coreboot.org/1080 for details.

-gerrit