ARM: dts: artpec: use 1 GiB RAM

There has never been an artpec6 devboard produced
with less than 1 GiB RAM.

Increase the default value to 1 GiB RAM, so that we
can netboot with large initramfs without going OOM.
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/artpec6-devboard.dts

@@ -26,7 +26,7 @@ chosen {
 
 	memory {
 		device_type = "memory";
-		reg = <0x0 0x10000000>;
+		reg = <0x0 0x40000000>;
 	};
 };