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-lpddr3-4GB-1600.dtsi b/arch/arm/dts/rk3399-sdram-lpddr3-4GB-1600.dtsi
index fc4cccb..bf429c2 100644
--- a/arch/arm/dts/rk3399-sdram-lpddr3-4GB-1600.dtsi
+++ b/arch/arm/dts/rk3399-sdram-lpddr3-4GB-1600.dtsi
@@ -13,6 +13,8 @@
 		0x0
 		0xf
 		0xf
+		0xf
+		0xf
 		1
 		0x1d191519
 		0x14040808
@@ -28,6 +30,8 @@
 		0x0
 		0xf
 		0xf
+		0xf
+		0xf
 		1
 		0x1d191519
 		0x14040808