ARM: dts: aspeed: Correct palmetto device tree

Palmettos have 512MB of memory as opposed to the previously thought
256MB. Update the device trees accordingly.

We run the uart at 115200.
Signed-off-by: NCyril Bur <cyrilbur@gmail.com>
Signed-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-palmetto.dts

@@ -12,11 +12,11 @@
 
 	chosen {
 		stdout-path = &uart5;
-		bootargs = "console=ttyS4,38400 earlyprintk";
+		bootargs = "console=ttyS4,115200 earlyprintk";
 	};
 
 	memory {
-		reg = <0x40000000 0x10000000>;
+		reg = <0x40000000 0x20000000>;
 	};
 
 	reserved-memory {