arm: dts: mt7623: cleanup the mt7623n rfb uart nodes

This patch does a cleanup of the uart nodes in the dts file of the RFB. It
adds aliases, enables 2 more uarts and explicitly sets the uart mode of the
console.
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/boot/dts/mt7623n-rfb.dtsi

@@ -19,7 +19,7 @@
 
 / {
 	chosen {
-		stdout-path = &uart2;
+		stdout-path = "serial2:115200n8";
 	};
 
 	cpus {
@@ -43,6 +43,20 @@ cpu3 {
 	memory@80000000 {
 		reg = <0 0x80000000 0 0x40000000>;
 	};
+
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&uart1 {
+	status = "okay";
 };
 
 &uart2 {