mtd: rawnand: Pass a nand_chip object nand_erase_nand()

Let's make the raw NAND API consistent by patching all helpers and
hooks to take a nand_chip object instead of an mtd_info one or
remove the mtd_info object when both are passed.

Let's tackle the nand_erase_nand() helper.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index e0d98ca..e6360e1 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1548,7 +1548,7 @@
 int nand_markbad_bbt(struct nand_chip *chip, loff_t offs);
 int nand_isreserved_bbt(struct nand_chip *chip, loff_t offs);
 int nand_isbad_bbt(struct nand_chip *chip, loff_t offs, int allowbbt);
-int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
+int nand_erase_nand(struct nand_chip *chip, struct erase_info *instr,
 		    int allowbbt);
 
 /**