mtd: rename CONFIG_NAND -> CONFIG_MTD_RAW_NAND

Add more clarity by changing the Kconfig entry name.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
[trini: Re-run migration, update a few more cases]
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
diff --git a/configs/spear320_usbtty_nand_defconfig b/configs/spear320_usbtty_nand_defconfig
index d9e4e05..014d1a6 100644
--- a/configs/spear320_usbtty_nand_defconfig
+++ b/configs/spear320_usbtty_nand_defconfig
@@ -27,7 +27,7 @@
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_MTD_DEVICE=y
-CONFIG_NAND=y
+CONFIG_MTD_RAW_NAND=y
 CONFIG_PHY_GIGE=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_MII=y