ARM: dts: BCM53573: Specify serial console parameters

This adds baud rate, parity & number of data bits. It's required to get
serial working correctly.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm53573.dtsi

@@ -13,8 +13,12 @@
 / {
 	interrupt-parent = <&gic>;
 
+	aliases {
+		serial0 = &uart0;
+	};
+
 	chosen {
-		stdout-path = &uart0;
+		stdout-path = "serial0:115200n8";
 	};
 
 	cpus {