rockchip: dts: rk3399-puma: add 'same-as-spl' to the front of the boot-order

In the general case, we want to continue booting the full U-Boot
(contained in a discoverable FIT image) from the same device the SPL
stage was loaded from.  This prepends the 'same-as-spl' specifier to
our configurable boot-order to make this the default behaviour.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/rk3399-puma.dtsi

@@ -20,7 +20,8 @@
 
 	chosen {
 		stdout-path = "serial0:115200n8";
-		u-boot,spl-boot-order = &spiflash, &sdhci, &sdmmc;
+		u-boot,spl-boot-order = \
+			"same-as-spl", &spiflash, &sdhci, &sdmmc;
 	};
 
 	aliases {