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/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
index 4917d47..34559b7 100644
--- a/configs/microblaze-generic_defconfig
+++ b/configs/microblaze-generic_defconfig
@@ -44,6 +44,8 @@
 CONFIG_LED=y
 CONFIG_LED_GPIO=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_MTD_DEVICE=y
+CONFIG_MTD_PARTITIONS=y
 CONFIG_PHY_ATHEROS=y
 CONFIG_PHY_BROADCOM=y
 CONFIG_PHY_DAVICOM=y