mtd: rename CONFIG_MTD_DEVICE -> CONFIG_MTD

Like in Linux, just use CONFIG_MTD to compile the MTD stack.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
diff --git a/configs/db-xc3-24g4xg_defconfig b/configs/db-xc3-24g4xg_defconfig
index bfac43a..0d49d40 100644
--- a/configs/db-xc3-24g4xg_defconfig
+++ b/configs/db-xc3-24g4xg_defconfig
@@ -38,8 +38,8 @@
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MVTWSI=y
 # CONFIG_MMC is not set
+CONFIG_MTD=y
 CONFIG_DM_MTD=y
-CONFIG_MTD_DEVICE=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_SYS_NAND_USE_FLASH_BBT=y
 CONFIG_NAND_PXA3XX=y