rockchip: dts: rk3288-tinker: enable sdmmc pinctrl node in spl

rockchip pinctrl driver has update to use dts, so we need
to add the pinctrl config in SPL for sdmmc.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rk3288-tinker-u-boot.dtsi

@@ -28,3 +28,27 @@
 &gpio8 {
 	u-boot,dm-pre-reloc;
 };
+
+&pcfg_pull_none_drv_8ma {
+	u-boot,dm-spl;
+};
+
+&pcfg_pull_up_drv_8ma {
+	u-boot,dm-spl;
+};
+
+&sdmmc_bus4 {
+	u-boot,dm-spl;
+};
+
+&sdmmc_clk {
+	u-boot,dm-spl;
+};
+
+&sdmmc_cmd {
+	u-boot,dm-spl;
+};
+
+&sdmmc_pwr {
+	u-boot,dm-spl;
+};