arm: dts: qcom: Add #power-domain-cells property

clock controller nodes which also support power domains (gdscs') need
to have a #power-domain-cells property. Add these for gcc and mmcc
nodes of msm8974, gcc of apq8084 and msm8916.
Also update gcc and mmcc bindings for it.

Signed-off-by: Rajendra Nayak <[e-mail]>
Acked-by: Stephen Boyd <[e-mail]>
Signed-off-by: Andy Gross <[e-mail]>

Documentation/devicetree/bindings/clock/qcom,gcc.txt

···
 - #clock-cells : shall contain 1
 - #reset-cells : shall contain 1
 
+Optional properties :
+- #power-domain-cells : shall contain 1
+
 Example:
 	clock-controller@900000 {
 		compatible = "qcom,gcc-msm8960";
 		reg = <0x900000 0x4000>;
 		#clock-cells = <1>;
 		#reset-cells = <1>;
+		#power-domain-cells = <1>;
 	};

Documentation/devicetree/bindings/clock/qcom,mmcc.txt

···
 - #clock-cells : shall contain 1
 - #reset-cells : shall contain 1
 
+Optional properties :
+- #power-domain-cells : shall contain 1
+
 Example:
 	clock-controller@4000000 {
 		compatible = "qcom,mmcc-msm8960";
 		reg = <0x4000000 0x1000>;
 		#clock-cells = <1>;
 		#reset-cells = <1>;
+		#power-domain-cells = <1>;
 	};

arch/arm/boot/dts/qcom-apq8084.dtsi

···
 			compatible = "qcom,gcc-apq8084";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
+			#power-domain-cells = <1>;
 			reg = <0xfc400000 0x4000>;
 		};
 

arch/arm/boot/dts/qcom-msm8974.dtsi

···
 			compatible = "qcom,gcc-msm8974";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
+			#power-domain-cells = <1>;
 			reg = <0xfc400000 0x4000>;
 		};
 
···
 			compatible = "qcom,mmcc-msm8974";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
+			#power-domain-cells = <1>;
 			reg = <0xfd8c0000 0x6000>;
 		};
 

arch/arm64/boot/dts/qcom/msm8916.dtsi

···
 			compatible = "qcom,gcc-msm8916";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
+			#power-domain-cells = <1>;
 			reg = <0x1800000 0x80000>;
 		};