brcm63xx: switch to new partition layout specification

Now that we support parsing the expected upstream definition, update
the dts files to it.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/dts/bcm96318ref.dts

@@ -67,6 +67,10 @@
 		#size-cells = <1>;
 
 		linux,part-probe = "bcm63xxpart";
+
+		partitions {
+			compatible = "brcm,bcm963xx-cfe-nor-partitions";
+		};
 	};
 };