ARM: dts: exynos: Add missing memory node for Exynos5440 boards

The skeleton.dtsi file was removed in ARM64 for different reasons as
explained in commit ("3ebee5a2e141 arm64: dts: kill skeleton.dtsi").

These also applies to ARM and it will also allow to get rid of the
following DTC warnings in the future:

"Node /memory has a reg or ranges property, but no unit name"

But these boards don't have a memory node defined, so removing the
skeleton.dtsi inclusion in exynos5440.dtsi will cause a change in
the compiled DTB. Add a dummy memory node so the compiled DTB does
not change if the skeleton.dtsi is removed from exynos5440.dtsi.

Eventually the correct starting addresses and sizes should be used
but I didn't find that information.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos5440-sd5v1.dts

@@ -20,6 +20,12 @@
 		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel earlyprintk no_console_suspend mem=2048M@0x80000000 mem=6144M@0x100000000 console=ttySAC0,115200";
 	};
 
+	/* FIXME: set reg property with correct start address and size */
+	memory {
+		device_type = "memory";
+		reg = <0 0>;
+	};
+
 	fixed-rate-clocks {
 		xtal {
 			compatible = "samsung,clock-xtal";

arch/arm/boot/dts/exynos5440-ssdk5440.dts

@@ -21,6 +21,12 @@
 		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel earlyprintk no_console_suspend mem=2048M@0x80000000 mem=6144M@0x100000000 console=ttySAC0,115200";
 	};
 
+	/* FIXME: set reg property with correct start address and size */
+	memory {
+		device_type = "memory";
+		reg = <0 0>;
+	};
+
 	fixed-rate-clocks {
 		xtal {
 			compatible = "samsung,clock-xtal";