Workaround for some broken BIOSes that forgot to enable ATAchannels [patch]

[Soeren Schmidt]

It seems Maxim Sobolev wrote:
[ Charset KOI8-R unsupported, converting... ]
> Hi,
> 
> Attached please find a patch, which workaround a bug found in
> some BIOSes, which forget to enable ATA channels properly.
> This results in ATA driver not attaching properly and inability
> to use disk devices.

Hmm, what BIOS's do you see this on ? if that bit isn't set *alot*
of other things probably arent as well, which could cause real
problems if we try this.

-Søren