mtd: nand: Fix MediaTek MT7621 SoC build

nand_get_flash_type was reworked in commit 1ca6f948. This change
break the Mediatek MT721. Fix it adjust the function call parameters

+include/linux/mtd/rawnand.h:32:62: note: expected 'struct nand_chip *' but argument is of type 'struct mtd_info *'
+   32 | struct nand_flash_dev *nand_get_flash_type(struct nand_chip *chip,
+      |                                            ~~~~~~~~~~~~~~~~~~^~~~
+drivers/mtd/nand/raw/mt7621_nand.c:1189:48: error: passing argument 2 of 'nand_get_flash_type' from incompatible pointer type [-Werror=incompatible-pointer-types]
+      |                                                ^~~~
+      |                                                |
+      |                                                struct nand_chip *
+include/linux/mtd/rawnand.h:33:49: note: expected 'int *' but argument is of type 'struct nand_chip *'
+   33 |                                            int *maf_id, int *dev_id,

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>