nand: Embed mtd_info in struct nand_chip

nand_info[] is now an array of pointers, with the actual mtd_info
instance embedded in struct nand_chip.

This is in preparation for syncing the NAND code with Linux 4.6,
which makes the same change to struct nand_chip.  It's in a separate
commit due to the large amount of changes required to accommodate the
change to nand_info[].

Signed-off-by: Scott Wood <oss@buserror.net>
diff --git a/common/fb_nand.c b/common/fb_nand.c
index c770eff..e55ea38 100644
--- a/common/fb_nand.c
+++ b/common/fb_nand.c
@@ -62,7 +62,7 @@
 		return -EINVAL;
 	}
 
-	*mtd = &nand_info[dev->id->num];
+	*mtd = nand_info[dev->id->num];
 
 	return 0;
 }