mtd: rawnand: cadence: remove unused struct 'ecc_info'

'ecc_info' has been unused since the original
commit ec4ba01e894d ("mtd: rawnand: Add new Cadence NAND driver to MTD
subsystem").

Remove it.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/nand/raw/cadence-nand-controller.c

···
 	u8 cs[] __counted_by(nsels);
 };
 
-struct ecc_info {
-	int (*calc_ecc_bytes)(int step_size, int strength);
-	int max_step_size;
-};
-
 static inline struct
 cdns_nand_chip *to_cdns_nand_chip(struct nand_chip *chip)
 {