mtd: rawnand: Move JEDEC code to nand_jedec.c

This moves JEDEC related code to nand_jedec.c and JEDEC related
struct/macros to include/linux/mtd/jedec.h.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>