[PATCH] radeon: Use mdelay() instead of msleep() in atom_op_delay().

[Alan Cox]

> > So lets stick to practice, and the real world. Screwing up everything
> > else because of a crappy problem in your Atom BIOS code sucks but hey it
> > happens. screwing up everything because of a theoretical concern is just
> > dumb.
> 
> Thanks for the flowers, but it's not just a theoretical concern, see the
> bug report.

The bug report is a single specific case. Figure out the calling
paths afflicted by it, don't be lazy and just dump on everyone on every
path because of a special case you apparently can't be bothered to root
cause.

Alan