dt-bindings: trivial-devices: Add Maxim max15301, max15303, and max20751

The Maxim max15301, max15303, and max20751 devices are all simple PMBus
devices already in use, but have not been documented.

Signed-off-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250307230907.840875-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: robherring

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -185,6 +185,12 @@ properties:
           - maxim,max5484
             # PECI-to-I2C translator for PECI-to-SMBus/I2C protocol conversion
           - maxim,max6621
+            # InTune Automatically Compensated Digital PoL Controller with Driver and PMBus Telemetry
+          - maxim,max15301
+            # 6A InTune Automatically Compensated Converter with PMBus Telemetry
+          - maxim,max15303
+            # Multiphase Master with PMBus Interface and Internal Buck Converter
+          - maxim,max20751
             # mCube 3-axis 8-bit digital accelerometer
           - mcube,mc3230
             # Measurement Specialities I2C temperature and humidity sensor