iio: as3935: Use devm_delayed_work_autocancel()

Use devm_delayed_work_autocancel() instead of hand writing it.
It saves a few lines of code.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/8d5c50f191bd8f751849d72127f83b14a7636d64.1644755396.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>