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/tqma6s_wru4_mmc_defconfig b/configs/tqma6s_wru4_mmc_defconfig
index 9feced7..a564e43 100644
--- a/configs/tqma6s_wru4_mmc_defconfig
+++ b/configs/tqma6s_wru4_mmc_defconfig
@@ -63,6 +63,7 @@
 CONFIG_LED_STATUS_CMD=y
 CONFIG_PCA9551_LED=y
 CONFIG_FSL_USDHC=y
+CONFIG_MTD=y
 CONFIG_PHYLIB=y
 CONFIG_MII=y
 CONFIG_USB=y