Increase default amount of RAM for Base FVPs in FDTs

- Large RAM-disks may have trouble starting with 2GB of memory.
- Increase from 2GB to 4GB in FDT.

Change-Id: I12c1b8e5db41114b88c69c48621cb21247a6a6a7
diff --git a/fdts/fvp-base-gicv3-psci.dts b/fdts/fvp-base-gicv3-psci.dts
index 8bafe26..c51a672 100644
--- a/fdts/fvp-base-gicv3-psci.dts
+++ b/fdts/fvp-base-gicv3-psci.dts
@@ -115,10 +115,8 @@
 
 	memory@80000000 {
 		device_type = "memory";
-		reg = <0x00000000 0x80000000 0 0x80000000>;
-		/*
+		reg = <0x00000000 0x80000000 0 0x80000000>,
 		      <0x00000008 0x80000000 0 0x80000000>;
-		*/
 	};
 
 	gic: interrupt-controller@2f000000 {