dt-bindings: hwmon: Add MPS mp2993

Add support for MPS mp2993 controller
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Noah Wang <noahwang.wang@outlook.com>
Link: https://lore.kernel.org/r/SEYPR04MB6482EE5CA0C9A3F14863B999FAC72@SEYPR04MB6482.apcprd04.prod.outlook.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -294,6 +294,8 @@ properties:
           - mps,mp2973
             # Monolithic Power Systems Inc. multi-phase controller mp2975
           - mps,mp2975
+            # Monolithic Power Systems Inc. multi-phase controller mp2993
+          - mps,mp2993
             # Monolithic Power Systems Inc. multi-phase hot-swap controller mp5990
           - mps,mp5990
             # Monolithic Power Systems Inc. synchronous step-down converter mpq8785