Some hda hardware enablement commits from upstream 2.6.29.

[Tim Gardner]

Luke Yelavich wrote:
> Ok, here are two of the ones I wanted, from upstream linux-2.6.
> 
> 2d4663816064fabb68935f920bbd7ccdc7f9392d
> e0c0e943af71c0f840a1f6a32a8cf0b61ebc61e5
> 

cherry-picked
-- 
Tim Gardner tim.gardner at canonical.com