rockchip: rk3188: add -u-boot.dtsi for rock-rk3188

We should a -u-boot.dtsi for those config need by U-Boot only,
and other part sync with kernel.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/dts/rk3188-radxarock-u-boot.dtsi

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2018 Fuzhou Rockchip Electronics Co., Ltd.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+&cru {
+	u-boot,dm-spl;
+};
+
+&pinctrl {
+	u-boot,dm-spl;
+};
+
+&uart2 {
+	status = "okay";
+	u-boot,dm-spl;
+};

arch/arm/dts/rk3188-radxarock.dts

@@ -7,6 +7,7 @@
 /dts-v1/;
 #include <dt-bindings/input/input.h>
 #include "rk3188.dtsi"
+#include "rk3188-radxarock-u-boot.dtsi"
 
 / {
 	model = "Radxa Rock";
@@ -356,11 +357,6 @@
 	status = "okay";
 };
 
-&uart2 {
-	status = "okay";
-	u-boot,dm-spl;
-};
-
 &uart3 {
 	status = "okay";
 };

arch/arm/dts/rk3188.dtsi

@@ -105,7 +105,6 @@
 		compatible = "rockchip,rk3188-cru";
 		reg = <0x20000000 0x1000>;
 		rockchip,grf = <&grf>;
-		u-boot,dm-spl;
 
 		#clock-cells = <1>;
 		#reset-cells = <1>;
@@ -156,7 +155,6 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;
-		u-boot,dm-spl;
 
 		gpio0: gpio0@2000a000 {
 			compatible = "rockchip,gpio-bank";