rockchip: dm: convert fdt_get to dev_read

With the new dev_read functions available, we can convert the rockchip
architecture-specific drivers and common drivers used by these devices
over to the dev_read family of calls.

This covers the DRAM controller initialisation for the RK3188, RK3288
and RK3399... all of these read some of the tuning/setup/timing
parameters from the device-tree.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3399/sdram_rk3399.c b/arch/arm/mach-rockchip/rk3399/sdram_rk3399.c
index 1b91bb1..aae17d5 100644
--- a/arch/arm/mach-rockchip/rk3399/sdram_rk3399.c
+++ b/arch/arm/mach-rockchip/rk3399/sdram_rk3399.c
@@ -1132,13 +1132,11 @@
 {
 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 	struct rockchip_dmc_plat *plat = dev_get_platdata(dev);
-	const void *blob = gd->fdt_blob;
-	int node = dev_of_offset(dev);
 	int ret;
 
-	ret = fdtdec_get_int_array(blob, node, "rockchip,sdram-params",
-			(u32 *)&plat->sdram_params,
-			sizeof(plat->sdram_params) / sizeof(u32));
+	ret = dev_read_u32_array(dev, "rockchip,sdram-params",
+				 (u32 *)&plat->sdram_params,
+				 sizeof(plat->sdram_params) / sizeof(u32));
 	if (ret) {
 		printf("%s: Cannot read rockchip,sdram-params %d\n",
 		       __func__, ret);