dt-bindings: hwmon: Add MPS mp5920

Add support for MPS mp5920 controller

Signed-off-by: Alex Vdovydchenko <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

Documentation/devicetree/bindings/trivial-devices.yaml

···
           - mps,mp2975
             # Monolithic Power Systems Inc. multi-phase controller mp2993
           - mps,mp2993
+            # Monolithic Power Systems Inc. multi-phase hot-swap controller mp5920
+          - mps,mp5920
             # Monolithic Power Systems Inc. multi-phase hot-swap controller mp5990
           - mps,mp5990
             # Monolithic Power Systems Inc. digital step-down converter mp9941