iio: sca3000: stop interrupts via devm_add_action_or_reset()

iio: sca3000: stop interrupts via devm_add_action_or_reset()

Used devm_add_action_or_reset() for shutting down the interrupts.
Make sca3000_stop_all_interrupts() return void now that it always hooks
into devm cleanup.

No functional change intended.

Suggested-by: David Lechner <dlechner@baylibre.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>