ram: rk3399: migrate to use common code

For there are some structures and functions are common for all rockchip SoCs,
migrate to use the common code so that we can clean up reduandent codes.

Signed-off-by: YouMin Chen <cym@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3399-sdram-ddr3-1600.dtsi b/arch/arm/dts/rk3399-sdram-ddr3-1600.dtsi
index fcd01f8..23c7c34 100644
--- a/arch/arm/dts/rk3399-sdram-ddr3-1600.dtsi
+++ b/arch/arm/dts/rk3399-sdram-ddr3-1600.dtsi
@@ -13,6 +13,8 @@
 		0x0
 		0xf
 		0xf
+		0xf
+		0xf
 		1
 		0x80151015
 		0x14040902
@@ -28,6 +30,8 @@
 		0x0
 		0xf
 		0xf
+		0xf
+		0xf
 		1
 		0x80151015
 		0x14040902