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/smdkc100_defconfig b/configs/smdkc100_defconfig
index 76bb74d..b46b9a3 100644
--- a/configs/smdkc100_defconfig
+++ b/configs/smdkc100_defconfig
@@ -24,6 +24,6 @@
 CONFIG_ENV_IS_IN_ONENAND=y
 CONFIG_ENV_ADDR=0x40000
 # CONFIG_MMC is not set
-CONFIG_MTD_DEVICE=y
+CONFIG_MTD=y
 CONFIG_SMC911X=y
 CONFIG_SMC911X_BASE=0x98800300