arm64: dts: berlin4ct-dmp: add missing unit name to /memory node

This patch fixes the following DTC warning with W=1:

"Node /memory has a reg or ranges property, but no unit name"
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>

arch/arm64/boot/dts/marvell/berlin4ct-dmp.dts

@@ -54,7 +54,7 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
-	memory {
+	memory@1000000 {
 		device_type = "memory";
 		/* the first 16MB is for firmwares' usage */
 		reg = <0 0x01000000 0 0x7f000000>;