ARM: mvebu: do not duplicate the mpic alias

The mpic alias is already defined in the common armada-370-xp.dtsi, so
there's no need to repeat it at the armada-xp.dtsi and armada-370.dtsi
level.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

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

@@ -43,7 +43,7 @@
 				wt-override;
 			};
 
-			mpic: interrupt-controller@20000 {
+			interrupt-controller@20000 {
 				reg = <0x20a00 0x1d0>, <0x21870 0x58>;
 			};
 

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

@@ -31,7 +31,7 @@
 				wt-override;
 			};
 
-			mpic: interrupt-controller@20000 {
+			interrupt-controller@20000 {
 			      reg = <0x20a00 0x2d0>, <0x21070 0x58>;
 			};