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/cm_fx6_defconfig b/configs/cm_fx6_defconfig
index 218d3d6..b2bb1f2 100644
--- a/configs/cm_fx6_defconfig
+++ b/configs/cm_fx6_defconfig
@@ -63,7 +63,7 @@
 CONFIG_DM_KEYBOARD=y
 CONFIG_DM_MMC=y
 CONFIG_FSL_USDHC=y
-CONFIG_NAND=y
+CONFIG_MTD_RAW_NAND=y
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SF_DEFAULT_MODE=0