ARM: dts: s3c64xx: Remove skeleton.dtsi and fix DTC warnings for /memory

Remove the usage of skeleton.dtsi to fix the DTC warnings:

arch/arm/boot/dts/s3c6410-mini6410.dtb: Warning (unit_address_vs_reg):
/memory: node has a reg or ranges property, but no unit name
arch/arm/boot/dts/s3c6410-smdk6410.dtb: Warning (unit_address_vs_reg):
/memory: node has a reg or ranges property, but no unit name

Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/s3c6410-mini6410.dts

···
 	model = "FriendlyARM Mini6410 board based on S3C6410";
 	compatible = "friendlyarm,mini6410", "samsung,s3c6410";
 
-	memory {
+	memory@50000000 {
+		device_type = "memory";
 		reg = <0x50000000 0x10000000>;
 	};
 

arch/arm/boot/dts/s3c6410-smdk6410.dts

···
 	model = "SAMSUNG SMDK6410 board based on S3C6410";
 	compatible = "samsung,mini6410", "samsung,s3c6410";
 
-	memory {
+	memory@50000000 {
+		device_type = "memory";
 		reg = <0x50000000 0x8000000>;
 	};
 

arch/arm/boot/dts/s3c64xx.dtsi

···
  * nodes can be added to this file.
  */
 
-#include "skeleton.dtsi"
 #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
 
 / {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
 	aliases {
 		i2c0 = &i2c0;
 		pinctrl0 = &pinctrl0;