[ltp] Dropping thinkpad-acpi support for the model 570

[Damien Challet]

> Please use a recent acpidump and dmidecode, and send their output to me by
> private mail.  Please censor the UUID and serial numbers in the dmidecode
> output.
>
> Also, may I contact you for testing issues on the model 600?  Can you test
> an up-to-date version of thinkpad-acpi on the model 600 every 6 months or
> so and drop me a note if anything breaks?

With pleasure.

Damien