iio: adc: cc10001: Add devm_add_action_or_reset() to disable regulator.

As the voltage of this regulator is queried, we cannot use the
devm_regulator_get_enable() call and have to role our own disable.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20221016170950.387751-3-jic23@kernel.org