First set of IIO fixes for the 5.0 cycle.

Been a busy month, so these are rather later than they should have been.

* atlas-ph-sensor:
  - Temperature scale didn't correspond to the ABI.
* axp288:
  - A few different fixes around the TS-pin handling.
* ti-ads8688
  - Not enough space in the buffer used to build the scan to allow for
    the timestamp.
* tools - iio_generic_buffer
  - Make num_loops signed so that we really are running for ever
    rather than just a long time when we specify -1.
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