arm: dts: mt7623: fix available memory size on bananapi-r2

There is 2GB DDR3 available on bananapi-r2 board as [1] specified.

[1] http://www.banana-pi.org/r2.htmlSigned-off-by: Sean Wang <sean.wang@mediatek.com>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts

@@ -110,7 +110,7 @@ red {
 
 	memory@80000000 {
 		device_type = "memory";
-		reg = <0 0x80000000 0 0x40000000>;
+		reg = <0 0x80000000 0 0x80000000>;
 	};
 };