ARM: Cygnus: dts: fix NAND nodes names

This matches nand-controller.yaml requirements.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm-cygnus.dtsi

@@ -460,7 +460,7 @@ sdhci1: sdhci@18043000 {
 			status = "disabled";
 		};
 
-		nand: nand@18046000 {
+		nand_controller: nand-controller@18046000 {
 			compatible = "brcm,nand-iproc", "brcm,brcmnand-v6.1";
 			reg = <0x18046000 0x600>, <0xf8105408 0x600>,
 			      <0x18046f00 0x20>;

arch/arm/boot/dts/bcm911360_entphn.dts

@@ -82,8 +82,8 @@ &uart3 {
 	status = "okay";
 };
 
-&nand {
-	nandcs@1 {
+&nand_controller {
+	nand@1 {
 		compatible = "brcm,nandcs";
 		reg = <0>;
 		nand-on-flash-bbt;

arch/arm/boot/dts/bcm958300k.dts

@@ -60,8 +60,8 @@ &uart3 {
 	status = "okay";
 };
 
-&nand {
-	nandcs@1 {
+&nand_controller {
+	nand@1 {
 		compatible = "brcm,nandcs";
 		reg = <0>;
 		nand-on-flash-bbt;

arch/arm/boot/dts/bcm958305k.dts

@@ -68,8 +68,8 @@ &uart3 {
 	status = "okay";
 };
 
-&nand {
-	nandcs@1 {
+&nand_controller {
+	nand@1 {
 		compatible = "brcm,nandcs";
 		reg = <0>;
 		nand-on-flash-bbt;