ARM: dts: omap5-evm: Fix size of memory defined for EVM

Memory present for OMAP5-evm is 2GB. But in dts file
it is specified as 1GB. Correcting the same.
Signed-off-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

arch/arm/boot/dts/omap5-evm.dts

@@ -15,7 +15,7 @@
 
 	memory {
 		device_type = "memory";
-		reg = <0x80000000 0x40000000>; /* 1 GB */
+		reg = <0x80000000 0x80000000>; /* 2 GB */
 	};
 
 	vmmcsd_fixed: fixedregulator-mmcsd {