dt-bindings: trivial-devices: add mps,mp5998

Add dt-bindings for MPS mp5998 hot-swap controller.

Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250916095026.800164-1-chou.cosmo@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: cchoux

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -315,6 +315,8 @@ properties:
           - mps,mp5920
             # Monolithic Power Systems Inc. multi-phase hot-swap controller mp5990
           - mps,mp5990
+            # Monolithic Power Systems Inc. multi-phase hot-swap controller mp5998
+          - mps,mp5998
             # Monolithic Power Systems Inc. digital step-down converter mp9941
           - mps,mp9941
             # Temperature sensor with integrated fan control