First set of IIO fixes for the 4.3 cycle.

* twl4030 - incorrect readings for some channels due to a failure to
  initialize a bias regulator or configure the lines for input rather than
  USB use.
* lis3lv02 - a missunderstanding of the way the interrupts worked on this
  chip lead to activation of the wrong interrupt.
* sca3000 - an old bug meant that memory corruption could occur in the
  hardware ring buffer readout function.
* mxs-lradc - wrong temp offset.
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