dt-bindings: hwmon: Add mps mp5990 driver bindings

Add a device tree bindings for mp5990 device.
Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231113155008.2147090-2-peteryin.openbmc@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -125,6 +125,8 @@ properties:
           - mps,mp2973
             # Monolithic Power Systems Inc. multi-phase controller mp2975
           - mps,mp2975
+            # Monolithic Power Systems Inc. multi-phase hot-swap controller mp5990
+          - mps,mp5990
             # Honeywell Humidicon HIH-6130 humidity/temperature sensor
           - honeywell,hi6130
             # IBM Common Form Factor Power Supply Versions (all versions)