[coreboot] Patch merged into coreboot/master: 31887a0 libpayload: Add interrupt-queue underrun recovery to EHCI

the following patch was just integrated into master:
commit 31887a042a68fb05a6718183aaa1eded4ea3e4a1
Author: Nico Huber 
Date:   Thu Jun 14 13:08:36 2012 +0200

libpayload: Add interrupt-queue underrun recovery to EHCI

If the queue of an interrupt transfer runs out, we have to reset
    the queue head. This also introduces the use of a spare transfer
    descriptor (TD) in interrupt queues, which assures, that a processed
    TD  won't be reused until the host controller has written it back
    from his overlay.

Change-Id: Id0eeb2808b77f1c187f164eb34bd66f8f399938b
    Signed-off-by: Nico Huber

Build-Tested: build bot (Jenkins) at Wed Jun 20 21:23:49 2012, giving +1
Reviewed-By: Stefan Reinauer  at Wed Jun 20 21:08:02 2012, giving +2
See http://review.coreboot.org/1123 for details.

-gerrit