dt-bindings: iio: proximity: vl53l0x: Add IRQ support

Since IRQ support was added to the driver, update bindings accordingly.

Signed-off-by: Ivan Drobyshevskyi <drobyshevskyi@gmail.com>
Link: https://lore.kernel.org/r/20200916074458.873359-1-drobyshevskyi@gmail.com


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