arm: dts: berlin: add aliases for serial

This is to prepare for the using stdout-path in next commit.
Signed-off-by: NJisheng Zhang <jszhang@marvell.com>
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

arch/arm/boot/dts/berlin2.dtsi

@@ -47,6 +47,12 @@
 	model = "Marvell Armada 1500 (BG2) SoC";
 	compatible = "marvell,berlin2", "marvell,berlin";
 
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

arch/arm/boot/dts/berlin2cd.dtsi

@@ -47,6 +47,11 @@
 	model = "Marvell Armada 1500-mini (BG2CD) SoC";
 	compatible = "marvell,berlin2cd", "marvell,berlin";
 
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

arch/arm/boot/dts/berlin2q.dtsi

@@ -43,6 +43,11 @@
 	model = "Marvell Armada 1500 pro (BG2-Q) SoC";
 	compatible = "marvell,berlin2q", "marvell,berlin";
 
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;