dt-bindings: iio: light: isl76682: Document ISL76682

The ISL76682 is very basic ALS which only supports ALS or IR mode
in four ranges, 1k/4k/16k/64k LUX. There is no IRQ support or any
other fancy functionality. Document it as trivial device.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20231127212726.77707-1-marex@denx.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -179,6 +179,8 @@ properties:
           - isil,isl29030
             # Intersil ISL68137 Digital Output Configurable PWM Controller
           - isil,isl68137
+            # Intersil ISL76682 Ambient Light Sensor
+          - isil,isl76682
             # Linear Technology LTC2488
           - lineartechnology,ltc2488
             # 5 Bit Programmable, Pulse-Width Modulator