Convert CONFIG_MTD_PARTITIONS et al to Kconfig

This converts the following to Kconfig:
   CONFIG_MTD_PARTITIONS
   CONFIG_MTD_DEVICE

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/xilinx_zynqmp_zc1751_xm017_dc3_defconfig b/configs/xilinx_zynqmp_zc1751_xm017_dc3_defconfig
index 7e8b180..aaa025b 100644
--- a/configs/xilinx_zynqmp_zc1751_xm017_dc3_defconfig
+++ b/configs/xilinx_zynqmp_zc1751_xm017_dc3_defconfig
@@ -54,6 +54,7 @@
 CONFIG_DM_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
+CONFIG_MTD_DEVICE=y
 CONFIG_NAND=y
 CONFIG_NAND_ARASAN=y
 CONFIG_PHY_MARVELL=y