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/smdkc100_defconfig b/configs/smdkc100_defconfig
index f4ffd53..74e7b6b 100644
--- a/configs/smdkc100_defconfig
+++ b/configs/smdkc100_defconfig
@@ -20,6 +20,8 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=s3c-onenand:256k(bootloader),128k@0x40000(params),3m@0x60000(kernel),16m@0x360000(test),-(UBI)"
 CONFIG_ENV_IS_IN_ONENAND=y
 # CONFIG_MMC is not set
+CONFIG_MTD_DEVICE=y
+CONFIG_MTD_PARTITIONS=y
 CONFIG_NETDEVICES=y
 CONFIG_SMC911X=y
 CONFIG_SMC911X_BASE=0x98800300