brcm63xx: register serial through device tree

Register serial consoles through device tree instead of through board
data.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/dts/gw6000.dts

@@ -10,6 +10,7 @@
 
 	chosen {
 		bootargs = "root=/dev/mtdblock2 rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200";
+		stdout-path = "serial0:115200n8";
 	};
 
 	gpio-keys-polled {
@@ -53,3 +54,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pci &pinctrl_ext_mii>;
 };
+
+&uart0 {
+	status = "ok";
+};