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/zc5202_defconfig b/configs/zc5202_defconfig
index 5755361..b2f6376 100644
--- a/configs/zc5202_defconfig
+++ b/configs/zc5202_defconfig
@@ -40,6 +40,7 @@
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_FSL_USDHC=y
+CONFIG_MTD=y
 CONFIG_SPI_FLASH=y
 CONFIG_SF_DEFAULT_BUS=3
 CONFIG_SF_DEFAULT_MODE=0