mtd: plat-nand: Fixup kerneldoc for struct platform_nand_chip

The set_parts and priv members of struct platform_nand_chip where
removed in commit c36a6ef3845262ade529afb9f458738b1f196f83 but the
kerneldoc wasn't updated.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Artem Bityutskiy <dedekind1@gmail.com>

include/linux/mtd/nand.h

@@ -606,8 +606,6 @@ extern int nand_do_read(struct mtd_info *mtd, loff_t from, size_t len,
  * @bbt_options:	BBT option flags, e.g. NAND_BBT_USE_FLASH
  * @ecclayout:		ECC layout info structure
  * @part_probe_types:	NULL-terminated array of probe types
- * @set_parts:		platform specific function to set partitions
- * @priv:		hardware controller specific settings
  */
 struct platform_nand_chip {
 	int nr_chips;