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/omap3_overo_defconfig b/configs/omap3_overo_defconfig
index be604fd..ef33ef0 100644
--- a/configs/omap3_overo_defconfig
+++ b/configs/omap3_overo_defconfig
@@ -36,7 +36,7 @@
 CONFIG_ENV_IS_IN_NAND=y
 CONFIG_TWL4030_LED=y
 CONFIG_MMC_OMAP_HS=y
-CONFIG_NAND=y
+CONFIG_MTD_RAW_NAND=y
 CONFIG_SYS_NAND_BUSWIDTH_16BIT=y
 CONFIG_SPL_NAND_SIMPLE=y
 CONFIG_SMC911X=y