Second set of IIO fixes for the 4.10 cycle.

* afe4403
  - retrieve valid iio_dev in suspend / resume. Previously using the wrong
    dev for a call to dev_to_iio_dev.
* afe4404
  - retrieve valid iio_dev in suspend / resume. Previously using the wrong
    dev for a call to dev_to_iio_dev.
* dht11
  - Something seems to have caused a regression in timing on the raspberry pi
    2B.  However, the bug that it threw up was real. msleep was occasionally
    resulting in very long sleeps, over the limit possible to read from this
    chip. Switch to usleep_range to avoid this.  The timing needed by this
    part is very fiddly.
* max30100
  - wrong parenthesis around fifo count check meant it always read after the
    almost_full state had been reached. I've tagged this with a fixes tag which
    covers the last patch that it will not need precursor patches.  The bug
    predates that but will need backporting.
* palmas_gpadc.
  - retrieve valid iio_dev in suspend / resume. Previously using the wrong
    dev for a call to dev_to_iio_dev.
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