ARM: dts: Add a 64 bits version of the skeleton device tree

In order to be able to use more than 4GB address-cells and size-cells
have to be set to 2
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NLior Amsalem <alior@marvell.com>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/skeleton64.dtsi

+/*
+ * Skeleton device tree in the 64 bits version; the bare minimum
+ * needed to boot; just include and add a compatible value.  The
+ * bootloader will typically populate the memory node.
+ */
+
+/ {
+	#address-cells = <2>;
+	#size-cells = <2>;
+	chosen { };
+	aliases { };
+	memory { device_type = "memory"; reg = <0 0>; };
+};