Second set of IIO fixes for the 3.12 cycle.

One large fix here to add reference counting to IIO's buffers
in order to prevent them being prematurely freed. The actual code addition
is small but needs to be repeated in a number of different places.

A few small additional fixes:
1) Make sure that debugfs entries are removed early enough to prevent
a race.
2) Drop a stray regulator_put from ad8366 left over from the devm_ patches.
3) The ST magnetometer driver had incorrect register addresses for the
   actual data channels.
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