dt-bindings: mtd: add DT binding for s3c2410 flash controller

* Samsung S3C2410 and compatible NAND flash controller

Required properties:

- compatible : The possible values are:

	"samsung,s3c2410-nand"

	"samsung,s3c2412-nand"

	"samsung,s3c2440-nand"

- reg : register's location and length.

- #address-cells, #size-cells : see nand.txt

- clocks : phandle to the nand controller clock

- clock-names : must contain "nand"

Optional child nodes:

Child nodes representing the available nand chips.

Optional child properties:

- nand-ecc-mode : see nand.txt

- nand-on-flash-bbt : see nand.txt

Each child device node may optionally contain a 'partitions' sub-node,

which further contains sub-nodes describing the flash partition mapping.

See partition.txt for more detail.

Example:

nand-controller@4e000000 {

	compatible = "samsung,s3c2440-nand";

	reg = <0x4e000000 0x40>;

	#address-cells = <1>;

        #size-cells = <0>;

	clocks = <&clocks HCLK_NAND>;

	clock-names = "nand";

	nand {

		nand-ecc-mode = "soft";

		nand-on-flash-bbt;

		partitions {

			compatible = "fixed-partitions";

			#address-cells = <1>;

			#size-cells = <1>;

			partition@0 {

				label = "u-boot";

				reg = <0 0x040000>;

			};

			partition@40000 {

				label = "kernel";

				reg = <0x040000 0x500000>;

			};

		};

	};

};