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/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c
index ba038b1..f771e94 100644
--- a/fs/jffs2/jffs2_1pass.c
+++ b/fs/jffs2/jffs2_1pass.c
@@ -195,7 +195,7 @@
 			}
 
 			retlen = NAND_CACHE_SIZE;
-			if (nand_read(&nand_info[id->num], nand_cache_off,
+			if (nand_read(nand_info[id->num], nand_cache_off,
 						&retlen, nand_cache) != 0 ||
 					retlen != NAND_CACHE_SIZE) {
 				printf("read_nand_cached: error reading nand off %#x size %d bytes\n",
diff --git a/fs/jffs2/jffs2_nand_1pass.c b/fs/jffs2/jffs2_nand_1pass.c
index 9b7af09..d94c48f 100644
--- a/fs/jffs2/jffs2_nand_1pass.c
+++ b/fs/jffs2/jffs2_nand_1pass.c
@@ -796,7 +796,7 @@
 	u32 counterN = 0;
 
 	struct mtdids *id = part->dev->id;
-	mtd = nand_info + id->num;
+	mtd = nand_info[id->num];
 
 	/* if we are building a list we need to refresh the cache. */
 	jffs_init_1pass_list(part);
diff --git a/fs/yaffs2/yaffs_uboot_glue.c b/fs/yaffs2/yaffs_uboot_glue.c
index 5e99025..6d86871 100644
--- a/fs/yaffs2/yaffs_uboot_glue.c
+++ b/fs/yaffs2/yaffs_uboot_glue.c
@@ -141,8 +141,6 @@
 	}
 }
 
-extern struct mtd_info nand_info[];
-
 void cmd_yaffs_tracemask(unsigned set, unsigned mask)
 {
 	if (set)
@@ -171,7 +169,7 @@
 	dev = calloc(1, sizeof(*dev));
 	mp = strdup(_mp);
 
-	mtd = &nand_info[flash_dev];
+	mtd = nand_info[flash_dev];
 
 	if (!dev || !mp) {
 		/* Alloc error */
@@ -260,9 +258,7 @@
 		dev = yaffs_next_dev();
 		if (!dev)
 			return;
-		flash_dev =
-			((unsigned) dev->driver_context - (unsigned) nand_info)/
-				sizeof(nand_info[0]);
+		flash_dev = nand_mtd_to_devnum(dev->driver_context);
 		printf("%-10s %5d 0x%05x 0x%05x %s",
 			dev->param.name, flash_dev,
 			dev->param.start_block, dev->param.end_block,