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/kp_imx53_defconfig b/configs/kp_imx53_defconfig
index 931726b..8f3a938 100644
--- a/configs/kp_imx53_defconfig
+++ b/configs/kp_imx53_defconfig
@@ -37,6 +37,7 @@
 CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
 CONFIG_I2C_DEFAULT_BUS_NUMBER=0x1
 CONFIG_FSL_ESDHC_IMX=y
+CONFIG_MTD=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_SMSC=y
 CONFIG_FEC_MXC=y