staging:iio:adc:ad7280a: Switch to standard event control

This driver had a slightly non standard events ABI but there seems
to be no reason for not doing it with the core support for rising and
falling events on the two types of channels.

In theory the events on different daisy chained chips could be at
different levels, but the driver has never supported this and it doesn't
seem likely to be used so let us ignore that option.

Includes reordering so that we only set the software cached value
of the thresholds if the hardware write succeeds.

Signed-off-by: Jonathan Cameron <[email protected]>
Reviewed-by: Marcelo Schmitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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