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/bitmain_antminer_s9_defconfig b/configs/bitmain_antminer_s9_defconfig
index 15c7bdd..dd34cd7 100644
--- a/configs/bitmain_antminer_s9_defconfig
+++ b/configs/bitmain_antminer_s9_defconfig
@@ -58,7 +58,7 @@
 CONFIG_DM_GPIO=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
-CONFIG_MTD_DEVICE=y
+CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_NAND_ZYNQ=y
 CONFIG_NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS=y