mv643xx_eth SA_SHIRQ support patch

[Benjamin Herrenschmidt]

> Notice that benh is telling me that you should use SA_SHIRQ always and that
> SA_INTERRUPT should go away, and that you should contact him online if you
> have trouble with that.
> 
> > For the pegasos 2, you'll need the second patch which applies after
> > the one I previously sent for chrp_setup.c.
> 
> Ok, will test this anyway, and tell you how it works.

GHeh, ok, just picked up the discussion. Yes, there is really no reason
to use SA_INTERRUPT here, this is a thing of the past.

Ben.