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/da850evm_defconfig b/configs/da850evm_defconfig
index c28cee5..5ff2360 100644
--- a/configs/da850evm_defconfig
+++ b/configs/da850evm_defconfig
@@ -60,8 +60,8 @@
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_DAVINCI=y
 CONFIG_DM_MMC=y
+CONFIG_MTD=y
 CONFIG_DM_MTD=y
-CONFIG_MTD_DEVICE=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=30000000
 CONFIG_SPI_FLASH_STMICRO=y