rockchip: dts: rk3368: reduce the number of nodes seen in TPL

The RK3368 TPL stage always returns to the BootROM, so it has no need
for the eMMC, SD and SPI nodes.  This marks those nodes (that should
be included in SPL, but not TPL) as 'u-boot,dm-spl'.

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

arch/arm/dts/rk3368-lion-u-boot.dtsi

@@ -71,18 +71,18 @@
 };
 
 &emmc {
-	u-boot,dm-pre-reloc;
+	u-boot,dm-spl;
 };
 
 &sdmmc {
-	u-boot,dm-pre-reloc;
+	u-boot,dm-spl;
 };
 
 &spi1 {
-	u-boot,dm-pre-reloc;
+	u-boot,dm-spl;
 
 	spiflash: w25q32dw@0 {
-		u-boot,dm-pre-reloc;
+		u-boot,dm-spl;
 	};
 };