arm64: dts: qcom: sm8350: drop unused dispcc power-domain-names

Display clock controller bindings do not allow power-domain-names:

  sm8350-hdk.dtb: clock-controller@af00000: 'power-domain-names' does not match any of the regexes: 'pinctrl-[0-9]+'
	From schema: Documentation/devicetree/bindings/clock/qcom,dispcc-sm8x50.yaml
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221227163158.102737-1-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sm8350.dtsi

@@ -2803,7 +2803,6 @@ dispcc: clock-controller@af00000 {
 			#power-domain-cells = <1>;
 
 			power-domains = <&rpmhpd SM8350_MMCX>;
-			power-domain-names = "mmcx";
 		};
 
 		adsp: remoteproc@17300000 {