arm: dts: rockchip: turn LEDs on at boot for Radxa boards

Basically, Radxa's boards are intended to turn LEDs on at U-Boot.
add `default-state = "on"` to u-boot.dtsi.

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3328-rock-pi-e-base-u-boot.dtsi b/arch/arm/dts/rk3328-rock-pi-e-base-u-boot.dtsi
index 39bb66c..a30adb0 100644
--- a/arch/arm/dts/rk3328-rock-pi-e-base-u-boot.dtsi
+++ b/arch/arm/dts/rk3328-rock-pi-e-base-u-boot.dtsi
@@ -6,6 +6,12 @@
 #include "rk3328-u-boot.dtsi"
 
 / {
+	leds {
+		led-0 {
+			default-state = "on";
+		};
+	};
+
 	smbios {
 		compatible = "u-boot,sysinfo-smbios";