[MTD] NAND: Support for 16-bit bus-width on AT91.

Add support for 16-bit NAND bus-width for the AT91 NAND driver.

The 16-bit NAND is found on the Atmel AT91SAM9260-EK and AT91SAM9261-EK
boards.

Orignal Patch from Patrice Vilchez
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/at91_nand.c

@@ -128,6 +128,9 @@ static int __init at91_nand_probe(struct platform_device *pdev)
 	nand_chip->ecc.mode = NAND_ECC_SOFT;	/* enable ECC */
 	nand_chip->chip_delay = 20;		/* 20us command delay time */
 
+	if (host->board->bus_width_16)		/* 16-bit bus width */
+		nand_chip->options |= NAND_BUSWIDTH_16;
+
 	platform_set_drvdata(pdev, host);
 	at91_nand_enable(host);