ARM: at91/DT: fix at91sam9n12ek memory node

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org> # 3.5+

arch/arm/boot/dts/at91sam9n12ek.dts

@@ -14,11 +14,11 @@ / {
 	compatible = "atmel,at91sam9n12ek", "atmel,at91sam9n12", "atmel,at91sam9";
 
 	chosen {
-		bootargs = "mem=128M console=ttyS0,115200 root=/dev/mtdblock1 rw rootfstype=jffs2";
+		bootargs = "console=ttyS0,115200 root=/dev/mtdblock1 rw rootfstype=jffs2";
 	};
 
 	memory {
-		reg = <0x20000000 0x10000000>;
+		reg = <0x20000000 0x8000000>;
 	};
 
 	clocks {