mtd: resync with Linux-3.7.1

This patch is essentially an update of u-boot MTD subsystem to
the state of Linux-3.7.1 with exclusion of some bits:

- the update is concentrated on NAND, no onenand or CFI/NOR/SPI
flashes interfaces are updated EXCEPT for API changes.

- new large NAND chips support is there, though some updates
have got in Linux-3.8.-rc1, (which will follow on top of this patch).

To produce this update I used tag v3.7.1 of linux-stable repository.

The update was made using application of relevant patches,
with changes relevant to U-Boot-only stuff sticked together
to keep bisectability. Then all changes were grouped together
to this patch.

Signed-off-by: Sergey Lapin <slapin@ossfans.org>
[scottwood@freescale.com: some eccstrength and build fixes]
Signed-off-by: Scott Wood <scottwood@freescale.com>
diff --git a/drivers/mtd/cfi_mtd.c b/drivers/mtd/cfi_mtd.c
index 8d74fa9..bbb71a1 100644
--- a/drivers/mtd/cfi_mtd.c
+++ b/drivers/mtd/cfi_mtd.c
@@ -244,12 +244,12 @@
 		mtd->size		= fi->size;
 		mtd->writesize		= 1;
 
-		mtd->erase		= cfi_mtd_erase;
-		mtd->read		= cfi_mtd_read;
-		mtd->write		= cfi_mtd_write;
-		mtd->sync		= cfi_mtd_sync;
-		mtd->lock		= cfi_mtd_lock;
-		mtd->unlock		= cfi_mtd_unlock;
+		mtd->_erase		= cfi_mtd_erase;
+		mtd->_read		= cfi_mtd_read;
+		mtd->_write		= cfi_mtd_write;
+		mtd->_sync		= cfi_mtd_sync;
+		mtd->_lock		= cfi_mtd_lock;
+		mtd->_unlock		= cfi_mtd_unlock;
 		mtd->priv		= fi;
 
 		if (add_mtd_device(mtd))