ARM: dts: armada-370-xp: Remove address from dsa unit name

The dsa node does not have a reg property, so remove the address from the
unit name.
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-370-rd.dts

@@ -172,7 +172,7 @@
 		};
 	};
 
-	dsa@0 {
+	dsa {
 		compatible = "marvell,dsa";
 		#address-cells = <2>;
 		#size-cells = <0>;

arch/arm/boot/dts/armada-xp-linksys-mamba.dts

@@ -301,7 +301,7 @@
 				      4500 1>;
 	};
 
-	dsa@0 {
+	dsa {
 		compatible = "marvell,dsa";
 		#address-cells = <2>;
 		#size-cells = <0>;