ARM: dts: BCM5301X: Switch Luxul XWC-1000 to the new fixed partitions syntax

This new syntax is slightly better designed & uses "compatible" string.
For details see Documentation/devicetree/bindings/mtd/partition.txt .
Signed-off-by: NRafał Miłecki <rafal@milecki.pl>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm4708-luxul-xwc-1000.dts

@@ -26,12 +26,18 @@
 
 	nand: nand@18028000 {
 		nandcs@0 {
+			partitions {
+				compatible = "fixed-partitions";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
 				partition@0 {
 					label = "ubi";
 					reg = <0x00000000 0x08000000>;
 				};
 			};
 		};
+	};
 
 	leds {
 		compatible = "gpio-leds";