arm64: dts: broadcom: bcm4908: Fix NAND node name

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

arch/arm64/boot/dts/broadcom/bcm4908/bcm4908.dtsi

@@ -296,7 +296,7 @@ uart0: serial@640 {
 			status = "okay";
 		};
 
-		nand@1800 {
+		nand-controller@1800 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "brcm,nand-bcm63138", "brcm,brcmnand-v7.1", "brcm,brcmnand";