ram: rk3328: use common sdram driver

RK3328 has a similar controller and phy with PX30, so we can use the
common driver for it and remove the duplicate 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/rk3328-sdram-lpddr3-1600.dtsi b/arch/arm/dts/rk3328-sdram-lpddr3-1600.dtsi
index cc0011c..d63c761 100644
--- a/arch/arm/dts/rk3328-sdram-lpddr3-1600.dtsi
+++ b/arch/arm/dts/rk3328-sdram-lpddr3-1600.dtsi
@@ -14,6 +14,8 @@
 		0x0
 		0x10
 		0x10
+		0x10
+		0x10
 		0
 
 		0x98899459
@@ -27,6 +29,8 @@
 		800
 		6
 		1
+		0
+		1
 
 		0x00000000
 		0x43041008