ARM: dts: mvebu: armada-390: add missing compatibility string and bracket

BugLink: http://bugs.launchpad.net/bugs/1634153

commit 061492cf upstream.

The armada-390.dtsi was broken since the first patch which adds Device Tree
files for Armada 39x SoC was introduced.
Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Fixes 538da83d ("ARM: mvebu: add Device Tree files for Armada 39x SoC and board")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

arch/arm/boot/dts/armada-390.dtsi

@@ -47,6 +47,8 @@
 #include "armada-39x.dtsi"
 
 / {
+	compatible = "marvell,armada390";
+
 	soc {
 		internal-regs {
 			pinctrl@18000 {
@@ -54,4 +56,5 @@ pinctrl@18000 {
 				reg = <0x18000 0x20>;
 			};
 		};
+	};
 };