arm64: dts: rockchip: fix poweroff on helios64

Adding the rockchip,system-power-controller property here will use the
rk808 to power off the system.

Fixes: 09e006c ("arm64: dts: rockchip: Add basic support for Kobol's Helios64")
Signed-off-by: Florian Klink <[email protected]>
Tested-by: Dennis Gilmore <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: flokli

arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts

@@ -276,6 +276,7 @@
 		clock-output-names = "xin32k", "rk808-clkout2";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pmic_int_l>;
+		rockchip,system-power-controller;
 		vcc1-supply = <&vcc5v0_sys>;
 		vcc2-supply = <&vcc5v0_sys>;
 		vcc3-supply = <&vcc5v0_sys>;