dt-bindings: iio: kionix,kxcjk1013: driver support interrupts

Device has interrupts support, which description was missing in the bindings.

Signed-off-by: David Heidelberg <david@ixit.cz>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210919203656.119742-1-david@ixit.cz


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