ARM: dts: imx: make clks node name generic

Node name should be generic, use "clock-controller" instead of
"ccm" for clks node.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl.dtsi

@@ -684,7 +684,7 @@ wdog2: wdog@20c0000 {
 				status = "disabled";
 			};
 
-			clks: ccm@20c4000 {
+			clks: clock-controller@20c4000 {
 				compatible = "fsl,imx6q-ccm";
 				reg = <0x020c4000 0x4000>;
 				interrupts = <0 87 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx6sl.dtsi

@@ -514,7 +514,7 @@ wdog2: wdog@20c0000 {
 				status = "disabled";
 			};
 
-			clks: ccm@20c4000 {
+			clks: clock-controller@20c4000 {
 				compatible = "fsl,imx6sl-ccm";
 				reg = <0x020c4000 0x4000>;
 				interrupts = <0 87 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx6sx.dtsi

@@ -582,7 +582,7 @@ wdog2: wdog@20c0000 {
 				status = "disabled";
 			};
 
-			clks: ccm@20c4000 {
+			clks: clock-controller@20c4000 {
 				compatible = "fsl,imx6sx-ccm";
 				reg = <0x020c4000 0x4000>;
 				interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx6ul.dtsi

@@ -546,7 +546,7 @@ wdog2: wdog@20c0000 {
 				status = "disabled";
 			};
 
-			clks: ccm@20c4000 {
+			clks: clock-controller@20c4000 {
 				compatible = "fsl,imx6ul-ccm";
 				reg = <0x020c4000 0x4000>;
 				interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx7s.dtsi

@@ -612,7 +612,7 @@ snvs_pwrkey: snvs-powerkey {
 				};
 			};
 
-			clks: ccm@30380000 {
+			clks: clock-controller@30380000 {
 				compatible = "fsl,imx7d-ccm";
 				reg = <0x30380000 0x10000>;
 				interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,