Second set of IIO fixes for the 4.16 cycle.

A slightly fiddly revert then fix pair in here as the bug lead to
an unused local variable that was then removed without us noticing
the bug.  The revert should only be needed on 4.16 - the fix
goes back futher.

* ccs811
  - Fix the transition from 'boot' to 'application' mode.  Fixes the case
    where the power is not cut between boot cycles.
* meson-saradc
  - Fix missing mutex_unlock in an error path.
* sd-modulator
  - Fix bindings doc to have the right value of io-channel-cells to reflect
    that this device type only ever outputs one channel.
* st-accel
  - Revert drop of redundant pointer patch.
  - Use the now available pointer to avoid overwriting the platform data
    pointer and causing trouble on reprobing the driver.
* st-pressure
  - Use local copy of the platform data pointer to avoid overwriting the
    one associated with the device, which would cause issues on reprobing
    the driver.
* stm32-dfsdm
  - Use the right regmap_cfg for the type of device.
  - Correct the ID passed to stop channel to be the channel one.
  - Correct which clock is used to allow for the 'audio' clock.
  - Fix allocation of channels when more than one is enabled.
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