arm64: dts: msm8996: Add #power-domain-cells property

Add #power-domain-cells property for both the gcc and mmcc
clock controller nodes as they both supports power domains (gdsc's)
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/msm8996.dtsi

@@ -147,6 +147,7 @@ gcc: clock-controller@300000 {
 			compatible = "qcom,gcc-msm8996";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
+			#power-domain-cells = <1>;
 			reg = <0x300000 0x90000>;
 		};
 
@@ -251,6 +252,7 @@ mmcc: clock-controller@8c0000 {
 			compatible = "qcom,mmcc-msm8996";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
+			#power-domain-cells = <1>;
 			reg = <0x8c0000 0x40000>;
 			assigned-clocks = <&mmcc MMPLL9_PLL>,
 					  <&mmcc MMPLL1_PLL>,