mtd: partitions: kill unused ecclayout struct

This field is not used.

Reported here:

http://lists.infradead.org/pipermail/linux-mtd/2015-October/062417.html

Reported-by: Brian Foster <brian.foster@maximintegrated.com>
Cc: Brian Foster <brian.foster@maximintegrated.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>

include/linux/mtd/partitions.h

@@ -41,7 +41,6 @@ struct mtd_partition {
 	uint64_t size;			/* partition size */
 	uint64_t offset;		/* offset within the master MTD space */
 	uint32_t mask_flags;		/* master MTD flags to mask out for this partition */
-	struct nand_ecclayout *ecclayout;	/* out of band layout for this partition (NAND only) */
 };
 
 #define MTDPART_OFS_RETAIN	(-3)