dt-bindings: power: supply: pm8941-coincell: Add PM8998 compatible

Add a specific compatible for the coincell charger present on PM8998.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/qcom,pm8941-coincell.yaml

@@ -16,7 +16,13 @@ maintainers:
 
 properties:
   compatible:
-    const: qcom,pm8941-coincell
+    oneOf:
+      - items:
+          - enum:
+              - qcom,pm8998-coincell
+          - const: qcom,pm8941-coincell
+
+      - const: qcom,pm8941-coincell
 
   reg:
     maxItems: 1