dt-bindings: power: ingenic,battery: add new compatibles

This binding can support Ingenic JZ4725B and JZ4770 SoCs, as they are
compatible with Ingenic JZ4740 battery.

Introduce the following compatible property combinations:
 compatible = "ingenic,jz4725b-battery", "ingenic,jz4740-battery",
 compatible = "ingenic,jz4770-battery", "ingenic,jz4740-battery"
Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/ingenic,battery.yaml

@@ -12,7 +12,13 @@ maintainers:
 
 properties:
   compatible:
-    const: ingenic,jz4740-battery
+    oneOf:
+      - const: ingenic,jz4740-battery
+      - items:
+        - enum:
+          - ingenic,jz4725b-battery
+          - ingenic,jz4770-battery
+        - const: ingenic,jz4740-battery
 
   io-channels:
     maxItems: 1