ARM: dts: rockchip: Add missing unit name to memory nodes in rk322x boards

This patch fixes the following DTC warnings:

"Node /memory has a reg or ranges property, but no unit name"
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3228-evb.dts

@@ -46,7 +46,7 @@ / {
 	model = "Rockchip RK3228 Evaluation board";
 	compatible = "rockchip,rk3228-evb", "rockchip,rk3228";
 
-	memory {
+	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};

arch/arm/boot/dts/rk3229-evb.dts

@@ -46,7 +46,7 @@ / {
 	model = "Rockchip RK3229 Evaluation board";
 	compatible = "rockchip,rk3229-evb", "rockchip,rk3229";
 
-	memory {
+	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};