ARM: mvebu: fix usb@ unit address on Armada 38x to match register address

On Marvell Armada 38x, the USB2 controller registers are at 0x58000,
so the corresponding Device Tree node should have a unit address of
58000, and not 50000. We were using 50000 due to an incorrect
copy/pastebin of Armada 370/XP code.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-388-db.dts

@@ -99,7 +99,7 @@
 				phy-mode = "rgmii-id";
 			};
 
-			usb@50000 {
+			usb@58000 {
 				status = "ok";
 			};
 

arch/arm/boot/dts/armada-388-gp.dts

@@ -135,7 +135,7 @@
 			};
 
 			/* CON4 */
-			usb@50000 {
+			usb@58000 {
 				vcc-supply = <&reg_usb2_0_vbus>;
 				status = "okay";
 			};

arch/arm/boot/dts/armada-38x.dtsi

@@ -435,7 +435,7 @@
 				status = "disabled";
 			};
 
-			usb@50000 {
+			usb@58000 {
 				compatible = "marvell,orion-ehci";
 				reg = <0x58000 0x500>;
 				interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;