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/TQM834x_defconfig b/configs/TQM834x_defconfig
index 4d730e2..229ad92 100644
--- a/configs/TQM834x_defconfig
+++ b/configs/TQM834x_defconfig
@@ -24,6 +24,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=TQM834x-0:256k(u-boot),256k(env),1m(kernel),2m(initrd),-(user);"
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_MTD_DEVICE=y
 CONFIG_PHY_MARVELL=y
 CONFIG_NETDEVICES=y
 CONFIG_TSEC_ENET=y