dt-bindings: trivial-devices: Add MPS MP2971 and MP2973

Add Monolithic Power Systems MP2971 & MP2973 to trivial devices.
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230714135124.2645339-2-Naresh.Solanki@9elements.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -119,6 +119,10 @@ properties:
           - fsl,mpr121
             # Monolithic Power Systems Inc. multi-phase controller mp2888
           - mps,mp2888
+            # Monolithic Power Systems Inc. multi-phase controller mp2971
+          - mps,mp2971
+            # Monolithic Power Systems Inc. multi-phase controller mp2973
+          - mps,mp2973
             # Monolithic Power Systems Inc. multi-phase controller mp2975
           - mps,mp2975
             # Honeywell Humidicon HIH-6130 humidity/temperature sensor