ARM: dts: armada-370-xp: Fixup l2-cache DT warning

l2-cache which is either an aurora-outer-cache or an aurora-system-cache
has a reg property so the unit name should contain an address.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

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

@@ -127,7 +127,7 @@ pcie2: pcie@2,0 {
 		};
 
 		internal-regs {
-			L2: l2-cache {
+			L2: l2-cache@8000 {
 				compatible = "marvell,aurora-outer-cache";
 				reg = <0x08000 0x1000>;
 				cache-id-part = <0x100>;

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

@@ -78,7 +78,7 @@ sdramc@1400 {
 				reg = <0x1400 0x500>;
 			};
 
-			L2: l2-cache {
+			L2: l2-cache@8000 {
 				compatible = "marvell,aurora-system-cache";
 				reg = <0x08000 0x1000>;
 				cache-id-part = <0x100>;