rockchip: popmetal-rk3288: add -u-boot.dtsi

Move U-Boot relate dts node/property into -u-boot.dtsi

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3288-popmetal-u-boot.dtsi b/arch/arm/dts/rk3288-popmetal-u-boot.dtsi
new file mode 100644
index 0000000..8ac7840
--- /dev/null
+++ b/arch/arm/dts/rk3288-popmetal-u-boot.dtsi
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Rockchip Electronics Co., Ltd
+ */
+
+#include "rk3288-u-boot.dtsi"
+
+&pinctrl {
+	u-boot,dm-pre-reloc;
+};
+
+&uart2 {
+	u-boot,dm-pre-reloc;
+};
+
+&sdmmc {
+	u-boot,dm-pre-reloc;
+};
+
+&emmc {
+	u-boot,dm-pre-reloc;
+};
+
+&gpio3 {
+	u-boot,dm-pre-reloc;
+};
+
+&gpio8 {
+	u-boot,dm-pre-reloc;
+};
+
+&sdmmc_bus4 {
+	u-boot,dm-spl;
+};
+
+&sdmmc_clk {
+	u-boot,dm-spl;
+};
+
+&sdmmc_cmd {
+	u-boot,dm-spl;
+};
+
+&sdmmc_pwr {
+	u-boot,dm-spl;
+};