dt-bindings: mfd: Add ROHM BD71879

As this chip was seen in several devices in the wild, add it.
Suggested-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/20240404195423.666446-2-andreas@kemnade.infoSigned-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml

@@ -17,7 +17,12 @@ description: |
 
 properties:
   compatible:
-    const: rohm,bd71828
+    oneOf:
+      - const: rohm,bd71828
+
+      - items:
+          - const: rohm,bd71879
+          - const: rohm,bd71828
 
   reg:
     description: