mtd: nand: Add+use mtd_to/from_nand and nand_get/set_controller_data

These functions are part of the Linux 4.6 sync.  They are being added
before the main sync patch in order to make it easier to address the
issue across all NAND drivers (many/most of which do not closely track
their Linux counterparts) separately from other merge issues.

Signed-off-by: Scott Wood <oss@buserror.net>
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 0b8b56f..a1f2cba 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -165,7 +165,7 @@
 
 static void fsmc_nand_hwcontrol(struct mtd_info *mtd, int cmd, uint ctrl)
 {
-	struct nand_chip *this = mtd->priv;
+	struct nand_chip *this = mtd_to_nand(mtd);
 	ulong IO_ADDR_W;
 
 	if (ctrl & NAND_CTRL_CHANGE) {
@@ -410,7 +410,7 @@
 	 * function, as it doesn't need to switch to a different ECC layout.
 	 */
 	mtd = nand_info[nand_curr_device];
-	nand = mtd->priv;
+	nand = mtd_to_nand(mtd);
 
 	/* Setup the ecc configurations again */
 	if (eccstrength == 1) {
@@ -479,8 +479,7 @@
 		(void  __iomem *)CONFIG_SYS_NAND_BASE;
 	nand->badblockbits = 7;
 
-	mtd = &nand->mtd;
-	mtd->priv = nand;
+	mtd = nand_to_mtd(nand);
 
 	switch (fsmc_version) {
 	case FSMC_VER8: