bcm63xx: dgnd3700-v1: add NAND support

NAND is used as extra storage on this device.

Signed-off-by: Daniel Gonzalez Cabanelas <dgcbueu@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bcm63xx/dts/bcm6368-netgear-dgnd3700-v1.dts

@@ -187,6 +187,32 @@
 	};
 };
 
+&nflash {
+	status = "okay";
+
+	nandcs@0 {
+		compatible = "brcm,nandcs";
+		#size-cells = <1>;
+		#address-cells = <1>;
+		reg = <0>;
+		nand-ecc-step-size = <512>;
+		nand-ecc-strength = <15>;
+		nand-on-flash-bbt;
+		brcm,nand-oob-sector-size = <64>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "storage";
+				reg = <0x0000000 0x8000000>;
+			};
+		};
+	};
+};
+
 &uart0 {
 	status = "okay";
 };