arm64: dts: rockchip: add syscon-reboot-mode DT node

Add syscon-reboot-mode driver DT node for rk3368 platform
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Tested-by: Caesar Wang <caesar.upstream@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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

@@ -45,6 +45,7 @@
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/pinctrl/rockchip.h>
+#include <dt-bindings/soc/rockchip,boot-mode.h>
 #include <dt-bindings/thermal/thermal.h>
 
 / {
@@ -639,6 +640,15 @@ pmu_io_domains: io-domains {
 			compatible = "rockchip,rk3368-pmu-io-voltage-domain";
 			status = "disabled";
 		};
+
+		reboot-mode {
+			compatible = "syscon-reboot-mode";
+			offset = <0x200>;
+			mode-normal = <BOOT_NORMAL>;
+			mode-recovery = <BOOT_RECOVERY>;
+			mode-bootloader = <BOOT_FASTBOOT>;
+			mode-loader = <BOOT_BL_DOWNLOAD>;
+		};
 	};
 
 	cru: clock-controller@ff760000 {