iio: frequency: ad9523: Use devm_regulator_get_enable()

This driver only turns the power on at probe and off via a custom
devm_add_action_or_reset() callback. The new devm_regulator_get_enable()
replaces this boilerplate code.

Note that in event of an error on the devm_regulator_get() the driver
would have continued without enabling the regulator which is probably
not a good idea.  So here we handle any error as a reason to fail the
probe(). In theory this may expose breakage on a platform that was
previously papered over but it seems low risk.

Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Michael Hennerich <[email protected]>
Reviewed-by: Matti Vaittinen <[email protected]>
Reviewed-by: Nuno Sá <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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