arm64: dts: imx8ulp: drop undocumented property in cgc

The clocks and clocks-names are not documented in binding doc,
and the clk-imx8ulp driver not use the undocumented property,
so drop them.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8ulp.dtsi

@@ -164,8 +164,6 @@ wdog3: watchdog@292a0000 {
 			cgc1: clock-controller@292c0000 {
 				compatible = "fsl,imx8ulp-cgc1";
 				reg = <0x292c0000 0x10000>;
-				clocks = <&rosc>, <&sosc>, <&frosc>, <&lposc>;
-				clock-names = "rosc", "sosc", "frosc", "lposc";
 				#clock-cells = <1>;
 			};
 
@@ -416,8 +414,6 @@ per_bridge5: bus@2d800000 {
 			cgc2: clock-controller@2da60000 {
 				compatible = "fsl,imx8ulp-cgc2";
 				reg = <0x2da60000 0x10000>;
-				clocks = <&sosc>, <&frosc>;
-				clock-names = "sosc", "frosc";
 				#clock-cells = <1>;
 			};