dt-bindings: clock: gcc-sc8180x: Add the missing CX power domain

The GCC block is (mostly) powered by the VDD_CX rail. Allow specifying
it in power-domains.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231230-topic-8180_more_fixes-v1-1-93b5c107ed43@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Documentation/devicetree/bindings/clock/qcom,gcc-sc8180x.yaml

@@ -31,10 +31,15 @@ properties:
       - const: bi_tcxo_ao
       - const: sleep_clk
 
+  power-domains:
+    items:
+      - description: CX domain
+
 required:
   - compatible
   - clocks
   - clock-names
+  - power-domains
 
 allOf:
   - $ref: qcom,gcc.yaml#
@@ -44,6 +49,7 @@ unevaluatedProperties: false
 examples:
   - |
     #include <dt-bindings/clock/qcom,rpmh.h>
+    #include <dt-bindings/power/qcom-rpmpd.h>
     clock-controller@100000 {
       compatible = "qcom,gcc-sc8180x";
       reg = <0x00100000 0x1f0000>;
@@ -51,6 +57,7 @@ examples:
                <&rpmhcc RPMH_CXO_CLK_A>,
                <&sleep_clk>;
       clock-names = "bi_tcxo", "bi_tcxo_ao", "sleep_clk";
+      power-domains = <&rpmhpd SC8180X_CX>;
       #clock-cells = <1>;
       #reset-cells = <1>;
       #power-domain-cells = <1>;