mtd: return badblockbits back

In commit c7b28e25 the initialization of
the backblockbits was accidentally removed. This patch returns it back,
because otherwise some NAND drivers are broken.

This problem was reported by "Saxena, Parth <parth.saxena@ti.com>" here:
http://lists.infradead.org/pipermail/linux-mtd/2011-April/035221.htmlReported-by: NSaxena, Parth <parth.saxena@ti.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Tested-by: NSaxena, Parth <parth.saxena@ti.com>
Acked-by: NSaxena, Parth <parth.saxena@ti.com>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Cc: stable@kernel.org [2.6.36+]
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/nand_base.c

@@ -3106,6 +3106,8 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 		chip->chip_shift += 32 - 1;
 	}
 
+	chip->badblockbits = 8;
+
 	/* Set the bad block position */
 	if (mtd->writesize > 512 || (busw & NAND_BUSWIDTH_16))
 		chip->badblockpos = NAND_LARGE_BADBLOCK_POS;