ARM: dts: rockchip: add missing device_type = "memory" to boards

The memory node is supposed to contain a device_type property marking
it as memory. The currently included boards miss this property.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3066a-bqcurie2.dts

@@ -49,6 +49,7 @@ / {
 	compatible = "mundoreader,bq-curie2", "rockchip,rk3066a";
 
 	memory {
+		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};
 

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

@@ -48,6 +48,7 @@ / {
 	compatible = "haoyu,marsboard-rk3066", "rockchip,rk3066a";
 
 	memory {
+		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};
 

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

@@ -48,6 +48,7 @@ / {
 	compatible = "chipspark,rayeager-px2", "rockchip,rk3066a";
 
 	memory {
+		device_type = "memory";
 		reg = <0x60000000 0x40000000>;
 	};
 

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

@@ -48,6 +48,7 @@ / {
 	compatible = "radxa,rock", "rockchip,rk3188";
 
 	memory {
+		device_type = "memory";
 		reg = <0x60000000 0x80000000>;
 	};
 

arch/arm/boot/dts/rk3288-evb.dtsi

@@ -43,6 +43,7 @@
 
 / {
 	memory {
+		device_type = "memory";
 		reg = <0x0 0x80000000>;
 	};
 

arch/arm/boot/dts/rk3288-firefly.dtsi

@@ -44,6 +44,7 @@
 
 / {
 	memory {
+		device_type = "memory";
 		reg = <0 0x80000000>;
 	};
 

arch/arm/boot/dts/rk3288-popmetal.dts

@@ -49,6 +49,7 @@ / {
 	compatible = "chipspark,popmetal-rk3288", "rockchip,rk3288";
 
 	memory{
+		device_type = "memory";
 		reg = <0 0x80000000>;
 	};
 

arch/arm/boot/dts/rk3288-r89.dts

@@ -48,6 +48,7 @@ / {
 	compatible = "netxeon,r89", "rockchip,rk3288";
 
 	memory {
+		device_type = "memory";
 		reg = <0x0 0x80000000>;
 	};