arm: dts: rockchip: rock-3a: drop u-boot,spl-boot-order

use common one defined in rk356x-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/rk3568-rock-3a-u-boot.dtsi b/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
index 801c91a..c785513 100644
--- a/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
+++ b/arch/arm/dts/rk3568-rock-3a-u-boot.dtsi
@@ -9,7 +9,6 @@
 / {
 	chosen {
 		stdout-path = &uart2;
-		u-boot,spl-boot-order = "same-as-spl", &sdmmc0, &sdhci;
 	};
 };