more pcf50606 patches

[Werner Almesberger]

Andrew Paulsen wrote:
> Bugzilla Bug 1181 - Battery temperature is incorrect
> http://bugzilla.openmoko.org/cgi-bin/bugzilla/show_bug.cgi?id=1181

I added some information about the circuit in the GTA01 and from the
TN11-3H103JT (that's the thermistor) data sheet.

Can you please check if your algorihm is still correct in the light
of this data ?

Thanks !

- Werner