iio: adc: ad7887: convert probe to device-managed functions

This is conversion of the driver to use device-managed functions.
The IIO registration and triggered buffer setup both have device-managed
versions.
The regulator disable needs to be handled via an action_or_reset handler.

With these changes, the remove hook is removed, and the error path is
cleaned up in probe.

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

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