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/aristainetos2_defconfig b/configs/aristainetos2_defconfig
index 0c8958d..4dd4148 100644
--- a/configs/aristainetos2_defconfig
+++ b/configs/aristainetos2_defconfig
@@ -42,7 +42,7 @@
 CONFIG_ENV_OFFSET_REDUND=0xE0000
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_FSL_USDHC=y
-CONFIG_NAND=y
+CONFIG_MTD_RAW_NAND=y
 CONFIG_NAND_MXS=y
 CONFIG_SPI_FLASH=y
 CONFIG_SF_DEFAULT_BUS=3