arm: dts: rockchip: move all rk3288 u-boot specific properties in separate dtsi files

In order to sync rk3288.dtsi from Linux it needed to
move all u-boot specific properties in separate dtsi files.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3288-evb-u-boot.dtsi b/arch/arm/dts/rk3288-evb-u-boot.dtsi
index 8ac7840..c8f5120 100644
--- a/arch/arm/dts/rk3288-evb-u-boot.dtsi
+++ b/arch/arm/dts/rk3288-evb-u-boot.dtsi
@@ -5,6 +5,17 @@
 
 #include "rk3288-u-boot.dtsi"
 
+&dmc {
+	rockchip,pctl-timing = <0x215 0xc8 0x0 0x35 0x26 0x2 0x70 0x2000d
+		0x6 0x0 0x8 0x4 0x17 0x24 0xd 0x6
+		0x4 0x8 0x4 0x76 0x4 0x0 0x30 0x0
+		0x1 0x2 0x2 0x4 0x0 0x0 0xc0 0x4
+		0x8 0x1f4>;
+	rockchip,phy-timing = <0x48d7dd93 0x187008d8 0x121076
+		0x0 0xc3 0x6 0x2>;
+	rockchip,sdram-params = <0x20d266a4 0x5b6 2 533000000 6 9 0>;
+};
+
 &pinctrl {
 	u-boot,dm-pre-reloc;
 };