ARM: dts: rockchip: Add missing unit name to memory nodes in rk3xxx 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/rk3066a-bqcurie2.dts

@@ -49,7 +49,7 @@ / {
 	model = "bq Curie 2";
 	compatible = "mundoreader,bq-curie2", "rockchip,rk3066a";
 
-	memory {
+	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};

arch/arm/boot/dts/rk3066a-marsboard.dts

@@ -47,7 +47,7 @@ / {
 	model = "MarsBoard RK3066";
 	compatible = "haoyu,marsboard-rk3066", "rockchip,rk3066a";
 
-	memory {
+	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};

arch/arm/boot/dts/rk3066a-rayeager.dts

@@ -48,7 +48,7 @@ / {
 	model = "Rayeager PX2";
 	compatible = "chipspark,rayeager-px2", "rockchip,rk3066a";
 
-	memory {
+	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};

arch/arm/boot/dts/rk3188-radxarock.dts

@@ -48,7 +48,7 @@ / {
 	model = "Radxa Rock";
 	compatible = "radxa,rock", "rockchip,rk3188";
 
-	memory {
+	memory@60000000 {
 		device_type = "memory";
 		reg = <0x60000000 0x80000000>;
 	};