ARM: dts: mvebu: db-dxbc2: use new style nand binding

Update the nand flash binding to the new style.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm/boot/dts/armada-xp-db-dxbc2.dts

@@ -70,12 +70,16 @@ &uart1 {
 
 &nand_controller {
 	status = "okay";
-	label = "pxa3xx_nand-0";
-	num-cs = <1>;
-	marvell,nand-keep-config;
-	nand-on-flash-bbt;
-	nand-ecc-strength = <4>;
-	nand-ecc-step-size = <512>;
+
+	nand@0 {
+		reg = <0>;
+		label = "pxa3xx_nand-0";
+		nand-rb = <0>;
+		marvell,nand-keep-config;
+		nand-on-flash-bbt;
+		nand-ecc-strength = <4>;
+		nand-ecc-step-size = <512>;
+	};
 };
 
 &sdio {