onenand:samsung Target dependent OneNAND chip probe function

Separate callback for probing OneNAND memory chip.
If no special function is defined, default implementation will be used.

This approach gives more flexibility for OneNAND device probing.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 5465562..dea42f4 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -101,6 +101,7 @@
 				size_t count);
 	unsigned short (*read_word) (void __iomem *addr);
 	void (*write_word) (unsigned short value, void __iomem *addr);
+	int (*chip_probe)(struct mtd_info *mtd);
 	void (*mmcontrol) (struct mtd_info *mtd, int sync_read);
 	int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
 	int (*scan_bbt)(struct mtd_info *mtd);