arm64: dts: rockchip: Add u-boot, spl-boot-order for ROCKPi N10

Add u-boot,spl-boot-order for ROCKPi N10, so-that it can able
to boot from eMMC and SDMMC in order.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rk3399pro-rock-pi-n10-u-boot.dtsi

@@ -5,3 +5,9 @@
 
 #include "rk3399pro-u-boot.dtsi"
 #include "rk3399-sdram-lpddr3-4GB-1600.dtsi"
+
+/ {
+	chosen {
+		u-boot,spl-boot-order = "same-as-spl", &sdhci, &sdmmc;
+	};
+};