mtd: rawnand: remove 'nand_exit_status_op()' prototype

This function is exported and its prototype is already placed in
include/linux/mtd/rawnand.h.
Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230823105235.609069-1-AVKrasnov@sberdevices.ru

drivers/mtd/nand/raw/internals.h

@@ -106,7 +106,6 @@ int nand_read_page_raw_notsupp(struct nand_chip *chip, u8 *buf,
 			       int oob_required, int page);
 int nand_write_page_raw_notsupp(struct nand_chip *chip, const u8 *buf,
 				int oob_required, int page);
-int nand_exit_status_op(struct nand_chip *chip);
 int nand_read_param_page_op(struct nand_chip *chip, u8 page, void *buf,
 			    unsigned int len);
 void nand_decode_ext_id(struct nand_chip *chip);