arm64: dts: marvell: add UART aliases and define stdout-path

This commit adds the necessary UART aliases to the main Armada 7K/8K
.dtsi file, and uses them to define the /chosen/stdout-path property
on the Armada 7040 DB board.
Suggested-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-7040-db.dts

@@ -51,6 +51,10 @@ / {
 	compatible = "marvell,armada7040-db", "marvell,armada7040",
 		     "marvell,armada-ap806-quad", "marvell,armada-ap806";
 
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
 	memory@00000000 {
 		device_type = "memory";
 		reg = <0x0 0x0 0x0 0x80000000>;

arch/arm64/boot/dts/marvell/armada-ap806.dtsi

@@ -54,6 +54,11 @@ / {
 	#address-cells = <2>;
 	#size-cells = <2>;
 
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+	};
+
 	psci {
 		compatible = "arm,psci-0.2";
 		method = "smc";