arm64: dts: rockchip: add clocks property to cru node rk3368

Add clocks and clock-names because the device has to have
at least one input clock.
Also in case someone wants to add properties that start with
assign-xxx to fix warnings like:
'clocks' is a dependency of 'assigned-clocks'
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20220329180550.31043-2-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3368.dtsi

@@ -747,6 +747,8 @@ reboot-mode {
 	cru: clock-controller@ff760000 {
 		compatible = "rockchip,rk3368-cru";
 		reg = <0x0 0xff760000 0x0 0x1000>;
+		clocks = <&xin24m>;
+		clock-names = "xin24m";
 		rockchip,grf = <&grf>;
 		#clock-cells = <1>;
 		#reset-cells = <1>;