adding support for new 2.6 chips in (lib)sensors

[mds4 at verizon.net (Mark Studebaker)]

try steps 13-17 (if I counted right) in doc/developers/new_drivers.
holler if you need more help.

Jean Delvare wrote:
> Hi MDS (and others),
> 
> I would like to add support for the 2.6 lm83 and lm90 drivers to
> libsensors/sensors. Although it should be obvious how to do that, I just
> can't find where it is. Any hints?
> 
> Thanks.
>