ARM: dts: Fix memory node in skeleton64.dtsi

Update the reg property of the memory node in
skeleton64.dtsi to reflect the fact that the root node uses
address-cells=2 and size-cells=2.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/skeleton64.dtsi

@@ -9,5 +9,5 @@
 	#size-cells = <2>;
 	chosen { };
 	aliases { };
-	memory { device_type = "memory"; reg = <0 0>; };
+	memory { device_type = "memory"; reg = <0 0 0 0>; };
 };