First set of IIO fixes for the 4.11 cycle. Regression fixes from 4.10.

These are fixes that came in just to late for the 4.10 cycle.

Two drivers made an accidental assumption of structure arrangement for
struct iio_dev that are no longer true.  It was a typo in the first place
that happened to work until some elements were added to the structure.

* mpl3115
  - don't rely on structure field ordering
* mpl115
  - don't rely on structure field ordering.
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