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/cm_t3517_defconfig b/configs/cm_t3517_defconfig
index f41f267..fa7f336 100644
--- a/configs/cm_t3517_defconfig
+++ b/configs/cm_t3517_defconfig
@@ -39,6 +39,7 @@
 CONFIG_LED_STATUS_BOOT_ENABLE=y
 CONFIG_LED_STATUS_BOOT=0
 CONFIG_MMC_OMAP_HS=y
+CONFIG_MTD_PARTITIONS=y
 CONFIG_NAND=y
 CONFIG_NETDEVICES=y
 CONFIG_SMC911X=y