Add LPS25HB driver for the new Airbot NXT board

[robert-b]

ready for review.

[digitalentity]

Thanks! Looks ok to me. Will test on my boards and merge.

[robert-b]

There is at least one problem.
the output data rate is 25hz - i cannot get the scheduler working with such a slow update rate.
you may have a look - i just hurried up to complete the driver.

[digitalentity]

Ok, noted. Will fix that.

[robert-b]

ohh, the new baro needs an entry in the gui as well.

[digitalentity]

Doesn't look like valid baro readings to me. Needs debugging. Do you have datasheet for this sensor?

[digitalentity]

Superceded by #3192