dt-bindings: adc: provide max34408/9 device tree binding document

The hardware binding for i2c current monitoring device with overcurrent
control.

Signed-off-by: Ivan Mikhaylov <fr0st61te@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231014211254.16719-2-fr0st61te@gmail.com


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